Attendance notes... where do they get them from?

[SuperSlim]

In attendance notes, the 10/15 SmackDown & ECW live event in Monterrey, Mexico drew a sellout crowd of 11,000 fans paying just under $500,000; 10/16 in Puebla, Mexico, drew a sellout crowd of 10,000 fans; 10/17 at Palacio de los Deportes in Mexico City drew a sellout crowd of 20,000 fans paying $750,000, the 10/18 show at Palacio de los Deportes in Mexico City also drew a sellout crowd of 20,000 fans paying $750,000; 10/16 Raw in Huntsville, Alabama drew 6,000; 10/17 in Columbus, Georgia drew 7,000; and 10/18 in Dothan, Alabama drew 3,000.

I was at that show... how in the world could there have been 7,000 in there when the center doesn't even hold 7,000. Not even close to 7,000 and the event wasn't even sold out. Where do they get these numbers from?