People Forgetting that 152 had Penn/R-Mac on the card. With that fight, I think the PPV numbers would have been the same, as Penn is still an above average PPV draw and R-Mac would have helped since he is Canadian and labeled as a "GSP Protege".
But with the numbers 152 brought in with Jones and Vitor, who are hyped tremendously by the UFC, and while the fight was made on short notice, I think the difference would have been 50k PPV buys had the fight been given more time to be advertised. I still believe neither guy is a huge PPV draw and neither can carry a PPV on their own without another PPV draw of a fighter.
Basically the UFC PPV booking is the same, but with the FOX deal, they are contractually obligated to put on 18 FREE shows a year! They cant limit the number of free shows on FOX network and scaling back on PPV would hurt them financially, as the PPV buys are big source of their income.