How do the finances actually work for the maiko? Are they paying their living and tuition by working jobs like in this chapter? I'd assume the fee isn't that small if you want your dinner to have a geiko (or just a maiko) performing and pouring your beer. Of course the restaurant will take a good portion of it (food & drinks), but the professor is also paying someone for Sumire to be there. I'd assume Sumire doesn't see any of that money. Once she's a full geiko, I believe she will represent herself and work as an entrepreneur, pocketing everything her work produces, minus taxes.