Played Alabama the first year in the SEC and it sold out. I doubt it would sell out now.
Iowa State used to bring far more fans than any of the SEC schools. They don't travel well likely because Missouri is in the Midwest - not the Southeast. As I said previously SEMO, North Texas, Central Michigan and Tennessee were the first 4 home games in 2021. Tennessee had the lowest attendance of the 4 schools.
Perhaps if they had spent the cash influx differently things wouldn't be like this but the vast majority - well over $100 million - was spent on luxury suites. SEC has a rule preventing fans from leaving at halftime to tailgate and then re-entering the stadium. That makes halftime for blue collar fans a miserable experience. Can't get to a toilet or concession stand because they never expanded the concourse to accommodate for the crush of fans. After spending an initial $75 million for luxury suites on the East side of the stadium they spent another $100 million for a new practice facility and they ripped out affordable family seating in the South end zone and installed more luxury suites.
Be thankful the people running Missouri aren't running Iowa State.