PPV Sales can't be compared to Super Bowl viewership numbers, considering there's a pretty significant difference between watching something included with your existing TV subscription versus paying another $50+ to watch a one-night event. I'm not trying to argue that boxing matches are necessarily on the same level of viewership as the Super Bowl, but you can't compare them directly like that. I'm also not arguing that boxing could sell out NFL stadiums over multi-week spans, I'm directly arguing the point that "there aren't enough boxing fans in the US to fill an entire NFL stadium", which is completely false.