once again the more traffic you get the better and more $X,XXX you will get.
I have a friend in canada who is averaging about 2000 hits per day and generating about $80 u.s. per day.
then again, another person I know is averaging $200 per day and has no where near that sort of traffic but he has a great site and higly responsive lists too.
it all in the way you market and layout your page. Testing is important part as well.