Though negotiations are a rough game, you should never allow them to become a dirty game. Once you've agreed to a deal, don't back out of it unless the other party fails to deliver as promised. Your handshake is your bond. As far as I'm concerned, a handshake is worth more than a signed contract. As an entrepreneur, a reputation for integrity is your most valuable commodity. If you try to put something over on someone, it will come back to haunt you.