Pardon the french, but i hate it when u do a deal with some prick, you shake hands, then a few days later u find they sold the machine for more $ to someone else and went back on their word.     If someone does that, i say write them off and tell everyone you know that they arent a person u shld trust.
There are a few sellers up here who do that sort of crap on a regular basis. They wonder why they have a bad reputation and no one in QLD will deal with them. 

I havent had a specific machine that i have missed out on really by being too slow, but i have seen a number of titles around recently, for really really good prices, but havent had the money to spend like i did last year with a machine being purchased every fortnight. Its not a big deal, cause i know that i will find that title later for similar, if not less money.   I beieve in karma. If its meant too be, its meant too be.

There is always tomorrow and a better seller and better machine around the corner so to speak.