Why did Mayweather vs Berto do such terrible PPV numbers?

[DARTH SILKWORMS]

I'm looking through mayweathers PPV numbers and they are massive, but why did the Berto fight do such terrible numbers?

Mayweather vs. Pacquiao was such a massive fight. Who was going to get excited for Mayweather vs. Berto a few months later?

[nubianpiye]

Better than Wilder v Fury and yet Wilder expects to earn more than £50 mill

[Razor Ramon]

A) Fighting Berto, who by that point wasn't even peak Berto, and never had a chance against any version of Floyd
B) Pac-Mayweather had happened, people kept buying their fights before then to see what would happen and if it affected the big fight that everyone wanted. Once it happened the continual tease was over