Originally Posted by BigFurry

People who are so interested in foot fetish porn that they are willing to pay for it... no, they will never get bored of foot fetish porn. Just like you will never get bored of hamburgers, ice cream, or sex. ;)

They will get bored of your style, yes. They will cancel and move on to the next membership. Even the best paysites' members only stay a member for a few months ON AVERAGE. If they could retain members for one year on average, they would be paying affiliates $100 PPS instead of $30 PPS, and everyone would send their traffic to them.

You have to aim to make your content as various WITHIN a niche as you can, so your members will stay longer. To be honest almost no paysite is good at this. Almost every paysite is producing the same stuff over and over again, only the girl is different.
If every new scene you create had a different "sub-fetish", you should be able to retain the members long. However if every scene follows the same script, such as "girl posing, girl giving a footjob, girl getting fucked with her feet showing", people will get bored quickly.

These days it's easier than ever to see what people are interested in. Just go to any tube site or Clips4Sale, and check the trending videos for a category or keyword. If you did such research before producing every video, I think you could be very successful.

Even with that, at any given moment if you look at your paying members, most of them will be new people. You'll always need big inflow of new traffic to keep your number of members steady -- and even more to grow.

There are SOME sites that can serve all genres and people might stay a member for years. But it's impossible for you to compete with them. Videobox, Bang.com, or PornHub Premium -- they have 60.000-150.000 scenes online. A "multi-genre" site with old looking content and 300 scenes won't get you many members.