How many PPV buys would Mayweather-Tyson do?

I was just having this discussion with a friend. Both are over the hill, more so Tyson of course. BUT, the fact that Floyd would be fighting one of the best HWs ever and the massive size difference would possibly make this the most interesting Floyd fight ever. Now of course, Tyson has been through so much and would be so out of shape.....he may gas after chasing Floyd around for 2 rounds. However, the puncher's chance is so significant that people would be glued to the TV screen for 10 Rounds of Floyd running, just hoping for Tyson to hit Floyd. Hell, an arm punch might be enough to knock Floyd to the other side of the ring. Would this fight outdo Floyd-Pac?