Bixby Snyder
IBTFAD
If they sold out "almost every game" and still had average attendance at 700 seats below capacity that would mean they would have had many games in front of no fans at all.
It's actually 625 below capacity averaged out over a season of 41 home games and a total of 25,625. So you could have 10 games where the team had an average of about 2,500 under capacity and you'd still be able to say most of the games were sold out.