hi

can someone let me know by his experience that how man ad units per site are working good. i mean 2 or 3 or 4. and which ad sizes earn the best? i have 50k+ traffic per day to my bitcoin and money related website and i wish to earn maximum. so please suggest me what ad sizes i should use and how many ad units.

i learned from faq pages that even there are 3 ad units at one page but only one of them get unique hit. but what if one ip has not visited a-ads banner yet and when that ip visits then 160x600 size ad unit displays including 3 text ads of 3 different advertisers. in this case for all those 3 advertisers that ip is unique in this case 3 unique impressions should be counted and publisher should earn money for 3 unique impression. i am sure this is not the case right now?

thanks

maven