The Otters seemed to have a better community appeal, whether that was through better marketing, or whether people had more discretionary income, ect. They did a lot a better a bringing fans into the build than the Chill have done so far.
I think the best shot for St. Charles is selling the Family Arena to Lindenwood University who has expressed interest in buying it, in exchange for the Daniel Boone Home (owned by the university).
Lindenwood already holds their gardaution ceremony there, and they have NCAA D1 Women's hockey in the CHA, as well as Men's ACHA D1 and D2. I know they would eventually like to get the Men's team to D1 sometime down the road. The Family Arena is a short drive from campus for students. Not sure how D1 NCAA hockey would work there but Lindenwood has had talks in the past with St. Charles about purchasing it. In fact last year before the Arena football, soccer, and Chill teams were anounced Lindenwood submitted an offer sheet for it.
For those of you unfamiliar with Lindenwood: (and I don't mean to advertise believe me) but here are their sports websites.
NCAA D2 Athletics (Plus D1 Women's Hockey):
http://www.lindenwoodlions.com/
Student Life Sports (ACHA Men's Hockey):
http://www.lindenwoodlionssls.com/