Crackhead/Tweaker? $10 and a sandwich.
Str8 Guys? $25 and a 6 pack
Twinks? $25-50
Studs? $50-100
Porn Stars? $100+

Amateurs would be low end of the scale, guys with any experience other than giving it away on yahoo would be higher scale. If you're reselling the shows, the smarter guys will want more.

I sent a PM with a little more info for you, Lee.