Again, this is not about fan support. If it was Rutgers wouldn't be in the Big 10.
CSU and ISU are very similar universities with similar enrollments. They have access to the Denver market, we have access to the Des Moines market. Outside of us being in a Power 5 conference, what advantages do we have over CSU?
We were an original member of the Big 6 Conference, Big 7, and Big 8, and finally the Big 12. If we were not an original member we would likely not be where we are at today. That is the difference.