My 2(-4) Cents (per click):* Most of these posts mention Adsense when they explain why they don't make a whole lot of money. Adsense is not very effective in many niches (for example, "funny stories" would only get you roughly 2-4 cents per click). Sure, you can't all start a forum about Mesothelioma Lawyers, but you can seek more intuitive, less hated methods of generating profit than Adsense.

*I'm so sorry for that intro, I just had to do it :)