Sprint - 18K+
Intrust - 15K+
Allen Fieldhouse - 16K+
Bramlage - 12K+
Expo - 10K+
BiCenter - 7K+
American Star Casino is 3,500-6K depending on arrangement.
Gross Memorial - 6K+

After those everything drops below 5K.

Intrust and Sprint center do not have much "onsite" parking. People complained to no end about parking when Intrust was built but it really hasn't stopped many going to events there and lets be honest we all could use a walk here and there. Lot's of options to get there if you can't walk far and don't qualify for handicap parking.

Topeka bids better for kids state because in part it has a much larger economic impact on the city than it would in Wichita. Better return. Intrust is almost too big for kids state when you consider price of rent and what they need out of blocking 3-4 dates on their calendar. And don't start on the hotel pricing....any city that host a event that maxes out the hotel capacity will increase rates, fact of life.