Attendance is an embarassment at conference tournaments as well as the NCAA tournament. I was in KC while the Big 12 was there and attended a game and I would say it was 40%-50% full in the first round. We paid about $20 for $45 tickets via scalpers. 10th row lower level ticket for two games for $20!!
The issue for the NCAA's is to find a sponsoring school. In Des Moines, it would have to be Drake or ISU and they would have to push for it. Lot of work for their athletic dept. Other than the chance to see great basketball, it is really overrated for the impact on the community. I would recommend that if they ever play in KC or Minneapolis or close, to go see them, especially the later rounds.