Thanks for the feedback guys.
I think its important to actually work out why the visitor is there in the first place and what sort of demographic they are for sure. I think “free bonus” banners and as Pokerstar says, targeted ads will work better than the normal stuff. Should be an interesting experiment.
For me a lot of it is brand building anyway. Brand building is the reason that my principle domain is Oggs.com rather than a keyword-rich domain.
Cheers
Simmo!
PS. my initial thread said 750,000 impressions but in fact the advert is in rotation and i think its a 1 in 10 rotation.