This is tangential to your post but from the rumours I read Carmack is not the Rockefeller of tech you'd expect given the contributions and the impact he's made on the entire industry. While it's not plainly stated his fortune is believed to be far less than $100M. Likely less than $50M. Which is mind boggling to me given that Palmer Luckey walked away with something in the vicinity of a billion dollar windfall. It looks like Carmack always received the short end of the stick whenever he went to work for somebody else.