The history of breaking commitments, you read what he said. Some of us feel that people that back out of cue deals as a habit are a POS and don't want the hassle of doing business with them, or we at least want to have the knowledge so like he said we can structure the deal accordingly, like the "you have 4 hours to send paypal or it is back on the market". Some of us feel that people who sell a cue to someone else, after they already had already committed to a deal with you, are a POS.
For some of us keeping your word, and knowing who else does or does not keep their word, is important. To others like you, keeping your word is not important to you personally and you don't care if you deal with people who keep their word or not. The solution here is EASY. Have negative feedback for buyers that back out of deals, and for sellers that sell a cue to someone else after you had already agreed to buy it. Now the people to whom keeping your word is important will have that info and can adjust who they deal with accordingly. People like you that don't care if people keep their word or not can simply scan someone's iTrader feedback and ignore all the ones that say "backed out after agreeing to purchase" or "sold the cue to someone else after we had already made a deal" and decide if you want to deal with them based on the other feedback.
SIMPLE. Everybody gets what they want. It doesn't hurt you a bit to have the information and to just ignore what doesn't matter to you or that you don't agree with. It does however hurt the people to whom the information is important if they don't have it.
