Interesting to look at the numbers in football. Whenever Iowa has a losing season, their attendance drops 2-6K. during their lowest point in the last 20 years, Iowa's average attendance dropped 9K from 70K to 61K over a 3 year time frame. Iowa has only had one extended time period where they were not a bowl team and they didn't hold up.
Iowa State on the other hand actually had its highest average following chizdick's first year with just 2 wins. Iowa State started building the fan base with DMac. It grew every year he was here until 03-05. Then it plateaued. However during disappointing seasons or the seasons following disappointing seasons, attendance never dropped more than 2K. ISU has not fluctuated from 45K average attendance since 2002. We have not been bowling since 2005 and have actually increased our average attendance numbers since that time. That is a result of people that became fans as kids in the DMac era becoming adults and buying tickets. Or people that actually attended ISU caring about football. There was no reason to care in the 90's so people didn't become fans.
There is no doubt that Iowa has more fans and when either team is winning Iowa will bring more fans. It is a function of their long term success. But when Iowa had a bad three year run they lowered their attendance more where as ISU held steady. So if Iowa has more fans, and they STILL lowered their attendance that means there were a lot more fans that disappeared when they were losing.
If you want to argue that ISU has a cap on its fanbase, that is valid
That's pretty tough to argue with. Good stuff.