Fan bases grow a bit with lots of winning, and a bit more when that winning lasts for more than just 3 or 4 years in a row. But real fan bases are there when the team loses. SoCar football left the ACC with a winning record against only UVA and Wake, and was then, 1970-71, averaging close to 65,000 per game. SoCar with a lot of 5 and 6 win teams and not a single team finishing Top 10 ever, was averaging about 70,000 when it got the SEC offer.Fan bases grow with wins. Casual team fans like watching good football.
That is the kind of football fan base that always matters. Without that fanbase, SoCXar would not have gotten invited by the SEC.