Flying is a very small world. Everyone has a mate somewhere else and once you make a "name" for yourself getting the next job becomes all the harder. Every reference form sent out says "Would you re-employ this person ?" If you've run off and not paid the answer is definately going to be no. Never run away in breach of contract no matter how good the next job looks. You don't know how long the great jobs going to last.
If you really have to leave and can not repay the bond then, provided you are not actually refusing to pay, then legally the company holding your bond have to at least consider and have a very good reason for not accepting a reasonable repayment schedule over a reasonable period of time. I know several people who have gone down this route successfully spreading a large bond pay off over up to two years without getting themselves on the Chief Pilots network !