Oh - don't be so self-righteous Bealzebub - To leave a company earlier than the bond expiry date and pay off the bond is to COMPLY with the terms of the contract; NOT - "money that you have expended as result of not fulfilling your contractual time obligations".
That is before getting onto the highly questionable application of bond terms in many companies, very often way in excess of actual costs, and applied in a way with the clear intent of making it almost impossible for employees the leave. Market forces (ie pay a wage which will encourage people to stay) is the morally correct way to go , and indeed that is the way it works in mainland Europe.