That's correct but it's important to note that it's 75% of the net ticket revenue (so gross ticket revenue minus the host school expenses) not the gross ticket revenue. So unless schools are overbidding they're still making some money off of ticket revenue for hosting playoff games.
So what else should they do? I'd say social media is the best and cheapest way to get the word out. I guess you can say they could buy ads on Twitter/Facebook/TV/Radio but that seems like a low return investment. With them only getting 25% of net ticket revenue selling 1000 more tickets for $40 each would be $10k (assuming those extra thousand tickets sold have minimal additional expenses attached to them). Is that worth it to them to dump money into marketing playoff tickets?
Notorious--Bisonville all-time POTY
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There's a bunch of info on it at this site: https://www.ncaa.org/championships/division-i-football
Basically schools in contention for the playoffs send the NCAA a proposed budget for each round they'd like to host which includes estimates for the number of tickets they think they'll sell and expenses and that acts as their "bid". Those bid/budget packs were due by 11/15. Minimum bid to host this year was $30k for the first round and goes up by $10k for each round until it hits $60k for the semis. A seeded school only needs to submit a minimum bid (and meet the NCAA's host facility requirements) to host that particular round.