80k is a lot of money, but this must suck, especially if you feel like you were an integral part of the company's succcess - some German researchers found that compensation perception is more on "fairness" than the actual numbers, if you'd made 80k and the founders 200k, maybe you'd have been OK with it.

I know research is good, but you really don't need research to figure that out. You don't want to feel screwed over