So you think you know more then those of us that actually do work in porn?
I worked as a designer for a major porn company for years. I've designed pay-per-minute sites for many of the big studios and stars. The professionally designed sites always produced more sales. Professionally designed websites are more pleasing to the eye and they offer simpler intuitive functionality. This leads to a higher percentage of sales.
Most studies are flawed or they base it on a very small poll. You can have the best looking site ever, but if you don't update, have a personal touch or give a shit it will fail. Once again it goes back to work ethic. Websites fail all the time.
Those studies are not flawed. If people don't trust the site they fear giving you their credit card info.
The point is that you need to fire on all cylinders. You need to have a great site design that makes sense and update regularly with high quality content. Those are the 3 main things and from looking at your site I don't know that you have any.
1) Your site design is very 1995. No actual design effort.
2) You offer only one small video sample and the quality is low grade. The video isn't that great compared to your competitors and the audio is hissy. Your photo samples are just as bad. They are all thumbnails.
3) Your twitter feed is broken. It simply doesn't display.
4) Your price is too high for what you appear to offer. Your competitors charge the same price but appear to offer much more. It seems counter intuitive but if you dropped your price
You Might see more sales and more money.
Those are just the things I noticed right away. You can take them as insults or take them as advice on the things you should correct.