Somewhow he did not understand that if he makes an offer on A'gon, and it is accepted, he is obligated to follow through with the purchase.
When you make an offer on ebay, it is 100% binding, that is, your credit card gets charged and shipping proceeds the minute the seller accepts your offer. In other words, once your offer is accepted you can't change your mind. It's a very good system and Audiogon would do well to emulate it if they don't already.