Well, yes and no. Sure, you can get hit with an algorithm change or penalty that destroys all your traffic. However, if you have good people who know what they are doing, this is not likely to happen, and if it does, it is easy (in most cases) to get your visits back. Panda and Penguin are another story, but if you get hit by those it is typically not accidental.
To give you an idea of just how much money is being spent on paid search, take a look at Google. Google's AdWords program is the most used pay-per-click (PPC) advertising program available today. While the tech giant owns YouTube and Android, among hundreds of other profitable brands, AdWords accounts for roughly 70% of their revenue -- which speaks wonders for its effectiveness.

Blair Symes is the Director of Content Marketing at DialogTech, the leading provider of marketing analytics for phone calls. Over the past 20 years, he has published hundreds of articles and eBooks on a wide range of marketing topics, including phone call analytics, conversion optimization, and omni-channel attribution. He can be reached at bsymes@dialogtech.com.

You control the cost of search engine marketing and pay nothing for your ad to simply appear on the search engine. You are charged only if someone clicks on your ad, and only up to the amount that you agreed to for that click. That’s why SEM is also known as pay per click (PPC), because you only get charged for each click that your ad generates. No click? No charge.
There’s also a lot of stuff even just around how much having a few simple images in your LinkedIn Pulse or blog post can really increase engagement. We’re becoming a much more visual society as it is. If you look at every social network, there’s now the ability to do video, to add photos. And so the more that you can capitalize on that, the better.
When it is time for your organization to start creating new products or enhancing items already on your product line, organic search can maximize your efficiency and gauge market demand. You will be able to see which products are sparking the most interest through increases or decreases in organic search. You can then take the information from the Data Cube and compare it to trends within your own sites and the performance of your competitors to create a product line that maximizes your investment.
New zero-result SERPs. We absolutely saw those for the first time. Google rolled them back after rolling them out. But, for example, if you search for the time in London or a Lagavulin 16, Google was showing no results at all, just a little box with the time and then potentially some AdWords ads. So zero organic results, nothing for an SEO to even optimize for in there.
Billions of people search the web every day. Search engine marketing (SEM for short) is how you can get your ads in front of these future customers where it counts: in premium spots on the first page of search results. You set your own budget and are charged only when your ad is clicked. This makes SEM an affordable way to reach more customers for businesses of all sizes — including yours.
I'm having a problem that I suspect many marketers share. Quite simply … SEO or just buy the traffic. I noticed that you switched to SEO because you like the passive income component. But when I consider ALL the work and ongoing moving parts to SEO .. visions of the hamster on a treadmill appear in place of couch potato cash. Have you noticed that there is always something new to do … now it's Google+ ect. and "more to do" is surly on it's way. It's reached the point where it's mind numbing.
Melissa: I completely agree. And the other thing about them adding and the way they’re added in the LinkedIn video option is that there’s an auto play. So as folks are scrolling through their feed, they’re more likely to stop with this video that just kind of starts playing, as well. I think that’s a big opportunity to really get some more eyes on your content.
Organic products have shifted from being a lifestyle choice for a small share of consumers to being consumed at least occasionally by a majority of Americans. National surveys conducted by the Hartman Group and Food Marketing Institute during the early 2000s found that two-thirds of surveyed shoppers bought organically grown foods. For a literature review of organic consumer studies, see the ERS report:

Search engines use complex mathematical algorithms to guess which websites a user seeks. In this diagram, if each bubble represents a website, programs sometimes called spiders examine which sites link to which other sites, with arrows representing these links. Websites getting more inbound links, or stronger links, are presumed to be more important and what the user is searching for. In this example, since website B is the recipient of numerous inbound links, it ranks more highly in a web search. And the links "carry through", such that website C, even though it only has one inbound link, has an inbound link from a highly popular site (B) while site E does not. Note: Percentages are rounded.
For our client: We rolled out a successful implementation of rel="author" for the three in-house content writers the company had. The client had over 300+ articles made by these content writers over the years and it was possible to implement rel="author" for all the aged articles. I advise anyone who has a large section of content to do so as it will only benefit the website. We were also in the process of rolling out further schema markup to the site's course content as it only has a benefit for CTR.
SEO may generate an adequate return on investment. However, search engines are not paid for organic search traffic, their algorithms change, and there are no guarantees of continued referrals. Due to this lack of guarantees and certainty, a business that relies heavily on search engine traffic can suffer major losses if the search engines stop sending visitors.[60] Search engines can change their algorithms, impacting a website's placement, possibly resulting in a serious loss of traffic. According to Google's CEO, Eric Schmidt, in 2010, Google made over 500 algorithm changes – almost 1.5 per day.[61] It is considered wise business practice for website operators to liberate themselves from dependence on search engine traffic.[62] In addition to accessibility in terms of web crawlers (addressed above), user web accessibility has become increasingly important for SEO.
Understanding the working mechanism of social algorithms is not a piece of cake. The algorithm for each social platform works differently. For instance, on Facebook, a core factor that affects the rankings of a post is its relevancy score, whereas on YouTube the total watch time of the video per session decides whether a video enters a ‘Recommended Video’ section or not.
Website ranking doesn't just come from what's on your website. Google, the number one search engine used today, uses a variety of other factors to rank websites. Things like your social media activity, appearances on other sites through interviews or guest blogging, and being listed as a resource on another site all increase your standing in Google's eyes.
Website saturation and popularity, or how much presence a website has on search engines, can be analyzed through the number of pages of the site that are indexed by search engines (saturation) and how many backlinks the site has (popularity). It requires pages to contain keywords people are looking for and ensure that they rank high enough in search engine rankings. Most search engines include some form of link popularity in their ranking algorithms. The following are major tools measuring various aspects of saturation and link popularity: Link Popularity, Top 10 Google Analysis, and Marketleap's Link Popularity and Search Engine Saturation.
Because so few ordinary users (38% according to Pew Research Center) realized that many of the highest placed "results" on search engine results pages (SERPs) were ads, the search engine optimization industry began to distinguish between ads and natural results.[citation needed] The perspective among general users was that all results were, in fact, "results." So the qualifier "organic" was invented to distinguish non-ad search results from ads.[citation needed]