The biggest selling PPV is a complicated issue Super.
Wrestlemania 17 is the biggest selling PPV in North America with roughly 1,040,000 buys.Wrestlemania 23 attracted 1,200,000 buys,but over 400,000 came from from outside of the US.Also,it's worth noting that PPV was mostly confined to North America until 2002.
Wrestlemania 3 did a 10.2 buyrate,which equals about 400,000 buys.This means 10% of the 4 million homes capable of receiving PPV in 1987 bought the event.That is probably the most impressive figure of all.