What makes a site a compelling buy to a surfer?
 

No, it's not as obvious as you think. We can say you can't make generalizations, but you can. You can say that the surfer wants to know you have a certain amount of content before he commits to spending $25.

Alot of tours have trailers, some don't. Some have samples, some don't. EpicCash's sites, such as EbonyStallions do not have either. ISpyCamelToe and BangBus are big on trailers. Obviously consumers want to see what they're signing up for, before they sign up.

From a tour, there's a certain amount of info you can gather indicating how much content is present. A tour that has 20 trailers from 20 separate scenes probably has a lot more content than a tour having 1 trailer.

With this being said, how much content do you think is necessary to make a site a compelling buy for a surfer?

I think it is all about niche. If a consumer sees something he is looking for, and can't find it elsewhere, he will sign up.

I agree. If the surfer feels that you have something unique aside from what they are looking for, they'll probably sign up. Then they'll recommend you to more friends and widen your reach.

customer will sign-up if you make him horny, he doesnt care about trailers, text, price...make him horny and he will pay

Good content and some high quality trailers should do the job ;)

umm, but isn't it the trailers and text that makes him horny? so how can he not care?

I agree with andrej, there are a lot of ways to make a surfer horny