As a very very very rough and approximate guide, it might go something like this (maybe :-0) ):
Banners / Buttons / Text = 1/500
(this will be affected amongst other factors by inbound traffic quality, niche match, page position, ad style, qualification, shave, hit count and amount of pre-selling).
Blind Banners / Links = 1/2500
(this will be affected amongst other factors by inbound traffic quality, niche match, page position, ad style, shave, hit count).
Popups = 1/5000
(this will be affected amongst other factors by, position in the console chain, aggressiveness of the console, inbound traffic quality, niche match, page position, ad style, shave, hit count, qualification and amount of pre-selling).
404s = likely to be roughly equivalent to popups, but be very wary of buying rejected, non-billable, foreign traffic.
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