I think there are lots of people that are willing to pay, but only if they have to.
TGP's for instance send alot of joins, and they give away free content. The surfers there start out looking for something free, and then find something they like enough that they want to pay more for, or get frustrated by the small free samples and pay to get full movies and picture sets.
If the TGP's were giving away full length movies, they wouldn't be sending joins anymore.
Most of these tube sites are giving away the steak and hoping you buy some steak sauce.
The owner of the largest one admitted that the site loses money, and that their goal is only to build up traffic and then sell the site, they have no interest in figuring out how to monetize the traffic.
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