There is no absolutes. You look at what you signed and what you give up. I have reneged on offers due to multiple reasons 1) the offer did not match what we ve

There is no absolutes. You look at what you signed and what you give up. I have reneged on offers due to multiple reasons 1) the offer did not match what we verbally discussed 2) I received a counter offer 3) I told them I was waiting on another offer, they forced me to decide early. The other offer came through, I called them back and told them I was withdrawing. Bottom line is, you have to live with your decisions. In all cases they also came back with more offers. For me personally, I could live with myself walking away from the first one, but I felt I would be totally mercenary if I took the counter-counter offer, and that it would lead to a work relationship where I would not be sure if they would keep me. Not because I had any particular moral qualms about it - I'm looking for the best work situation for me.