Bitcoin is very well suited to live performance porn... streaming shows performed to a live audience, and not recorded. It's a premium service, and one I think people will pay for.
my suggestion for all cam sites right now:
Have a pot for the client and tip slider.
The tip slider determines how many satoshi's per second to tip the dancer from the pot.
Like the show ?, ramp it up to 100 - about to blow set it to over 9000!!! satoshi etc etc.
its good feedback for the dancer and I think most users would appreciate the near-instant feedback from tips