My logic is that if you went to go work for Zynga and consciously ignored what you were working on (and the ethics therein) because of hopes for the big IPO exit, you are now left with no money and the last several years of your life spent on something you regret. I'm not making any statements about my opinion on Zynga, but based upon the press and popular opinion here, you can be sure there were engineers who turned a blind eye to what they were working on in hopes of striking it rich.

My point is that regardless of the monetary prospects, how you choose to spend your time matters, because the only certain thing is what you are working on now, not the payout in the future.