For those of you that sell banners / skyscrapers / whatever, how do you break down your rotations?
If you were selling an ad on a month by month basis instead of CPM, how many ads would you have in a rotation? Or do you just sell on a CPM basis if you have several ads on the go at once?
When we ran a free Web hosting site, we had rotations x5. One thing to keep in mind is that the higher the number of banners you are rotating, the less you can charge each advertiser for his or her advertising term.
NetBusinessTalk uses a rotation of 5 banners. I was thinking about going with only 3, but 5 seems to be the standard. I think it also depends on the amount of traffic your website has. If it has less, then you may only be able to put up 1 or 2 banners.
At least 1 banner less than the number of pages you have.
If you go over the amount of pages you have even if a visitor views all the pages there's a chance they will miss some ads. People paying for those spots wouldn't be happy.