If his interest is winning games it should be an empty seat. If his interest is making money then he wouldn't care who was in it. I think we know which it is.
Game day revenue (tickets, parking, concessions, team store etc) and about 27% of Cardinals revenue. Average attendance is 62,000. Let's say 15,000 of them are away fans in home seats. So 25%. That's about $30m a year in revenue he's making off those seats, about 10% is profit after all costs. From a total of $400m.
But he doesn't have to lose everything on those seats. He could offer discounts to schools kids and their families. Make them fans while young, build a fanbase for the future.
Seems shortsighted of him in my opinion to care so little about it.