LOL! I guess there's a site for everything. So you could say your adult diapers site has shitty earnings
Arcades, games, entertainment, celebrity, technical, hacker, script downloads, forums, free anything, and politics.
linkexchange1984, let's not hijack this thread into a "what's wrong with my following sites?". It's about bad niches and topics.
Mine is a wallpaper site ofcourse and also arcade games , software archive , forums , script selling site , proxies, image hosting and file hosting sites
If you have traffic, you can very well monetize it. Position the ads at suitable places preferably at the top levels (use minimum no. of ads, though) and blend the ads with the contents. Sure, you will achieve success
Insurance if the site is crappy... You only get ads from other similar crappy sites who advertise for arbitrage
Mine was an image hosting site. No matter how much I increased traffic, I couldn't break the $5/day mark. Now I have started fresh on a new niche but are still working to increase traffic.