Well speaking purely on my experience with GayTubeAccess, which is a fully paid tube style paysite, we broke even on the site after just 2 weeks of it being launched so there is money to be made however, a lot of tube site owners i speak with say conversion ratios are MUCH higher on tube traffic than more traditional methods of traffic generation.

If you are only going to be using hosted content from other programs on the tube you want to build id say go for it and give it a try, bandwidth usage for you should be very minimal.

Regards,

Lee