Sharpe, who's presently running a company called Legendary Marketer, teaching you how to duplicate his results, is a prime example. By understanding how Sharpe has constructed his value chain, positioned his offerings and built out his multi-modality sales funnels, you'll better get a larger grasp on things. As confusing as it sounds at the outset, all you need to do is start buying up products in your niche so that you can replicate their success.
Another illicit practice is to place "doorway" pages loaded with keywords on the client's site somewhere. The SEO promises this will make the page more relevant for more queries. This is inherently false since individual pages are rarely relevant for a wide range of keywords. More insidious, however, is that these doorway pages often contain hidden links to the SEO's other clients as well. Such doorway pages drain away the link popularity of a site and route it to the SEO and its other clients, which may include sites with unsavory or illegal content.
Many search engine marketers think who you link out to (and who links to you) helps determine a topical community of sites in any field or a hub of authority. Quite simply, you want to be in that hub, at the centre if possible (however unlikely), but at least in it. I like to think of this one as a good thing to remember in the future as search engines get even better at determining topical relevancy of pages, but I have never actually seen any granular ranking benefit (for the page in question) from linking out.

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