, if you accepted a new job, and then got a better offer with more pay closer to home two days later, would you go to the first job just because you said you accepted?
you might actually, depending on the industry/profession. might have longer term consequences that outweigh the short term benefit. so it all depends. my leaning towards decommitment has more to do with the coaches behaviour. now another way to go about it might be to say I have offers to your DD and X others for one spot, first one to accept/commit gets it. this actually happens in college recruiting. but this coach sounded like they were just bluffing, and had noone equal or better waiting on your response, he was just a jerk.