> I think people go to high-technology finance because they want to test themselves against a harder class of problem in a more adversarial setting against people who feel the same.

That and among developers, I think Jane Street has hit "mythological status". I've known about Jane Street since I was an undergrad looking for internships and it was always talked about like: "oh yeah, that's where the REALLY smart people go to work". I think a little part of going to work there for everyone is figuratively one-upping your friends from college, you made to the place where geniuses worked.