[dikdik]

Companies don't want to deal with being debt collectors is what this comes down to.

My last job paid for a good portion of my masters, every time I was reimbursed for tutition there was a set amount of time I had to still be with the company or I had to repay a certain amount.

Ended up leaving before finishing my degree due to really hating the company, I was prepared to hand back 15k, but they never even bothered asking for it. Same thing happened to a coworker of mine, though it was substantially less money in that case.