25-30 clicks?! I wish! I get about 150ish visitors a day, i'm lucky if i get 1 click but its usually between $0 and $1 a day i make from that site. I think it may be time to design my own theme for wordpress to help the clicks!
it does depend on the niche and the worth of keywords. I'm making around $30 a month with 100 visitor a day (+/- 10) I had to play with ad positioning though. Test where you place your ads.
This all depends on your niche, if you insurance site and SE visitors then you can make more than 10 USD a day.