Yeah, but I can't believe that all those companies didn't make him some very tempting offers.
Ahh here it is: http://en.wikipedia.org/wiki/Linus_Torvalds
"Red Hat and VA Linux, both leading developers of Linux-based software, presented Torvalds with stock options in gratitude for his creation.[13] In 1999, both companies went public and Torvalds' net worth shot up to roughly $20 million.[14][15]"