Each year since 2008 WWE has indirectly revealed the paid attendance of WrestleMania.
This year's event, WrestleMania 33 in Orlando, Florida, was attended by somewhere between 58,415 and 71,384. The median of that range is 64,900. The company announced 75,245 were in attendance at the live event itself and in subsequent press releases.
The announced attendance for WrestleMania being considerably higher than the actual paid attendance is normal for WWE (and it's not that unusual for other major sports too).
How WWE reaches its announced number each year, whether free tickets or staff are counted or whether it's just made up, isn't known.
Earlier this year WWE CEO Vince McMahon admitted the announced attendance for WrestleMania 32 attendance in Arlington, Texas, 101,763, was not a paid number.
“That included ushers and ticket-takers. It wasn’t 101,000 paid,” McMahon said on a quarterly conference call in February.
The Arlington police told Fightful in March there were 80,709 through the turnstiles at WrestleMania 32.
The ranges for paid attendance for WrestleMania events in the chart above were derived from WWE's Key Performance Indicators, a document WWE updates and publishes each quarter which includes attendance averages. For the quarter with WrestleMania, WWE always publishes an average attendance both with and without WrestleMania factored in, from which we can derive the range of actual paid attendance for the super event.