everything i had heard was the low limit was that in the past there just was not as much money in playing overseas. the idea isn't for the NBA team to pay the full buyout, but being able to contribute a decent % of it would be nice. back when the limit was last set(98? 05?) $500,000 covered 25%+ of most/every(?) buyout there was.
if there really is a salary cap abuse issue then maybe the change can be limited to draft picks?