Buying random banner spots at tubes for paysites will only work if you're selling some sick or very extreme shit. I'm pretty sure that is the reason why brazzers cut their flash banners promo vids with the most extreme action were surfers see violence and humiliation of women - that's about the only thing that may entice them to join. I do not think they're joining brazzers in droves though, most likely that's a numbers game for them, branding and eliminating of competition.
And even with the extreme and unusual stuff, you only have 2-3 months until surfers get used to the idea of your site and no longer join in any substantial numbers to justify your banner spot price. At least I haven't seen any paysite that lasted more than 3 months advertising at tubes - aside from brazzers/mofos of course, but they're the whole different story.
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