My first opinion would be to say "why not put more adds on?" then I would say "but then the site quality would deteriorate"
@Simon(View Post) Now that must require a lot of dedication to run the site with negligible income... I'm guessing you only get a few cents per click... I'm also guessing you recieve the average 2% clickers...or less :( There have been scenarios whereby people recieve $10 per click, although that is most likely websites that award commision for each purchase.