you can earn a lot of money by dp, just make some useful posts and then sell your signature for one month, for 1000 posts, one signature link may sell out for $10, you can have 4 signature links once you reach 25 posts! anyways, that's not the best way to earn! take that as a side business, and concentrate on your adsense, remove the adsense id from dp as you won't earn much, rather getting banned from adsense has a better chance! make a blog, add adsense to it, and then start making money with it, do search engine optimization(seo), check out the seo category of dp, am sure you will get to learn a lot of things and you will sure earn some big money!
Well, on DP I offered a collection of avatars for free. I created a page, with both the avatars and adsense. I have made $0.90 http://forums.digitalpoint.com/showthread.php?t=329477