Well here is the rub of it. Are you willing to pay a monthly subscription fee? How much?
A friend of mine has been doing a lot of direct sales (quite successfully I might add) to institutions, but the reason he's making money is that his target audience is already doing a lot of number crunching, they have big budgets, and he's directly saving them cash. Something like this is probably a "nice to have" feature that would be near impossible to convince the school to pay for, to speak nothing of a worthy price tag (greater than $2k/yr for instance).
I sounds like a fun project, but I would not expect it to pay much, if anything. And an ad model's monthly revenue would be a joke.