There is not any need for a physical body count. When you enter Carver Arena, the bar code on yout ticket is scanned and yours and all ticked customers are registered as in attendance.
Therefore they CAN provide a pretty accurate correct attendance.
They count tickets sold, which include non attending season ticket holders purely because, it looks better and for the reasons stated above..
Exactly......
Tell me there were 5000 people at the game but due to season ticket sales the money generated (alls that we, BU, REALLY cares about) was from 9k tickets sold.