As a general rule, I don't believe in negotiating behavior issues or obedience issues with children, let alone toddlers.
I do, however, encourage the maximum use of teaching and reteaching so that kids know what is expected, so that they know what their boundaries are, and so that they know that there will be some consequences to misbehavior.
I believe in rewarding good behavior, but not in offering a reward for obedience.
'Go to be nicely and you get a cookie' wouldn't be heard in my household. They are expected to go to bed nicely with or without a cookie. I may surprise them with a cookie, but never bribe them with it.
Do I pay for high grades? You bet. That isn't bribery, it is goal setting and acheivement.