"Surfers today want to watch porn for free, so why not give them fresh exclusive brand new scenes to view every single day."
It has always been like that. Even with good ratios like 1:100 on the traditional model, you still had 99 surfers who did not subscribe. And now ratios are getting worse, so you want to compensate by monetize those freebies with alternative ads? Well that will work if you target the (growing) traffic and keep the costs down. But in the end, it's about general economy and competition, and I can't see which competitive advantages that gives, if everyone do this. Sooner or later, economy is back on the track, and, if lucky, piracy face harder times, but then we all created a bunch of freebies instead.
