For the past two days, i've doing some testing with CB's banner ads ($1.10 CPM). I have approx 2000 unique visitors to my site everyday. However, the commission jumps by CENTS... So, I sent an email to CB in regards to how they count impressions.And got the response "Hello SUI is unique visitor not for promoter(publisher) but for central registration for all BGM services ( if the visitor get impression in another site you don't get revenue from this same user )" I had a little trouble understanding it at first.....(maybe it's just me being stupid ) But I figured does he mean visitor X went to one website (not mine but other ppls) and that site had the same CB graphical banner, then he's a valid unique for that site, and if the same vistor X later came to my site, I won't be credited???? Does taht make sense???? If so, then there're no way we publishers know how much we getting from the traffic to our sites.