Ya, I figured. It would be depend on whether schools have alternate revenue streams to keep the school going during that "no bitcoin sales" periods but my best guess is that no schools have that and they operate on a cycle of collect fees <> pay bills/cover expenses.
Only a handful of school have investors that can readily sort of the bills while in that waiting period. Even if that's the case, lomg term, they would still sell bitcoin.
If not majority of the students are paying in Bitcoin then they can probably create a Bitcoin Reserve Fund as the school intended. It would be impossible to not sell BTC if the majority of the students would pay in BTC since school maintenance is expensive since they need to pay for the structural maintenance, manpower, utilities, and more.
The benefit is in the adoption and onboarding of new people to use Bitcoin.
This is one of the possible major reason of the school why they want to accept Bitcoin payment for the school tuition fee. It will attract international students into enrolling in their school for payment convenience.