That's one part of it, I'm sure. Another part is that if you pipe up, you risk getting shunned: loss of income, loss of status, loss of being "part of the cool kids". Sure, you can get another job (that pays less) but you'll probably not work at the same cutting edge technology, and when you tell relatives or friends who you work for, their eyes don't light up.

If somebody offered me five to eight times as much as I make today with a huge boost in status and other positive side effects, and all they ask is to quiet down those silly principles, I'm not so sure I'd say no. "You can still do good in 5 years when you've made enough money to be set for life", I'd probably tell myself.