Porn for profit is doomed. Mainly because it's an outdated idea. Plus does anyone even really watch those porn DVD's past the first 10 or so minutes?
Porn is one of those things that used to be hard (no pun intended) to find and look at. Nowadays, however, it's just a click or two away and it's gotten to the point where there's hardly any shame in it anymore because everyone finally admitted that, yes, I watch porn.
But because it's so easy to find a clip online for free it makes no sense for people to pay any amount of money per month to see 30 minutes of bad fucking.