Kezzek, you should learn more about web ads before making such a point.
Internet advertising is content driven. Ads appear based on the content of a particular web page. Now, where would we be seeing the most Skins content specific pages? These message boards!! Thus, the ads show up on these message boards at a much higher rate.
I have also seen the Skins ads on eBay, MySpace, and several other sites, but I mainly see them on this message board and on Yahoo's message board because the content is 24/7 Skins, Skins, Skins.
And of course, you can pay a lot more money to have your content appear, but for the most part, when you are trying to have an effective, cost efficient campaign, you allow content to find your target market.