Seriously, there were no specifics here about how much each founder got of the 5 million and how much each founder got out of the 10 million. Taking the simplest view of 1/3 split, he screwed himself (and his outher founders) out of 1.33 million $. Doesnt seem worth it

Lot's of people are talking about investor's cashing out, if they had investors would this dude have been able to unilaterally force a worse deal so he could work at Facebook, seems unlikely

Talking completely out of my ass, we don't know what kind of package they were offering him. 10 mill isn't all for one person. Maybe he could make more over the coming years at FB than he would from a share of 10 mill after investors cash out.

Or maybe he was genuinely more excited about working at FB.