On one hand I want to say it's "evil" because we've grown up in a place where ads != content. And even though I feel as if I should object to ads being "hidden" among normal content, I don't.
The purpose of going to a website is to seek out a certain type of content. If somebody then paid to have that content delivered to you, what makes it inherently more "evil" than any other content? If it fulfills your need, what does it matter whether or not it were paid to be placed there? In fact, why must we know that they're ads at all?
"Cheating" would be placing a listing that does not accurately represent the content behind it. So if I click on your ad and it isn't what it claimed to be, that's misinformation. But an ad for a free trial of a Bingo Card Creator among other software listings seems equally legitimate, whether or not it was paid to be placed.
It's akin to product placement in movies. A scene requires somebody to be drinking a soda, so a beverage company approaches the director and says "well, while you're in the market for people drinking soft drinks, might we recommend Coca-Cola." The viewer ends up getting advertised to, sure, but the ad still fulfills the role of any other item that would have been there otherwise--it just happened to be paid for.