I'm a tech entrepreneur who works their brains out and has had some success for myself and my investors. I live among hedge fund guys and VC's who take home $1m/year +.
OK, maybe its third-person-singular — "a tech entrepreneur who works her brains out" is possible. But there are a fair number of relevant hits for "who works my * off|out". And I like the idea of first-person-singular their.
[Hat tip to Jonathan Mayhew.]