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Best of all, those that do it right succeed, and those who don't fail. But isn't that how business works anyway? If you produce good products, People come back for more and they tell their friends and refer you more and more customers and clients. If you don't make good on the promise, people complain write nasty reviews, and your sales die. Which in this case would serve you right if you are writing poor quality content, and you are tricking your reader into viewing an article which had been poorly written, and contains information which is such common sense it is hardly to be considered informational.
By answering a question for reader, or explaining the ins and outs of an industry or type or products, you are establishing credibility, educating them, and they are thankful for that. Thus, they're more likely to click on your link, come to your website, and from there it is up to you to convert those clicks the sales. That is a totally fair deal, as long as you don't abuse the privilege. And like I said above, those that have abused this venue have paid the price, and have been weeded out by the users, readers, and what would have been their future customers.