Lets say Eastern Washington announced that they want to be in the FBS. How much people in the area would help raise money for new stadium upgrade?

Remember, there are history that many schools in the FCS had a football rivalry for a long time with the FBS schools. Southern, SEC and ACC had the history when many of the schools were once together in Southern. West Virginia and Maryland was also part of Southern Conference at one time. I think with FBS P5 schools scheduling schools like Chattanooga, Samford, Furman, The Citadel, VMI and some others help keep that rivalry going. It is the same with the Big 12 playing schools that were former members of the SWC and also with Southland schools. North Alabama had history playing with Troy, Jacksonville State and some others. That includes Samford.

The problem is that the P5 schools are stuck with FCS schools like the ACC and SEC because of the history they had with those schools. They are smart by playing games with these old rivalry teams because the fans do come out and watch the game. That includes Samford fans going to Auburn or Alabama to watch the games.