because he has 5.2 million dollars
That's not a good reason.
I mean, that's great and all, but why just quit working (I hope Bisjac doesn't spend too much money this summer, that would really be dumb.) when you could make more money.
It's like Bill Gates quitting his job once he got 10 million; he could've lived off of that, but now he is worth well over 50 billion dollars. (Unless Bisjac disliked his job of course, otherwise there would be no reason to retire.)
What I'm saying is that although he could retire at 29 years old and blow half of his money partying over one summer, it's not a smart idea, when he could make much more knowing how much he's already accomplished.