Presumably nothing, except for maybe a contract that would rarely be enforced in practice. Tutoring sites like Wyzant are also like this. They make money on the

Presumably nothing, except for maybe a contract that would rarely be enforced in practice. Tutoring sites like Wyzant are also like this. They make money on the first session and the portion of people who go on through the service. Wyzant does things to try and make the marginal cost of each lesson more attractive, such as the fact that you can make a payment at the push of a button with the amount filled in, instead of working out a separate agreement by PayPal or similar. Another thing Wyzant does is to give you a higher cut the more you teach on the site, which incentivizes you to use the site even with your longer-term students, to rack up. Doesn't look like there's anything similar going on here. At any rate, it's kinda a weird business model, but it's been tried in parallel situations and led to successful sites.