I made it clear that:
I promised to pay full price
We agreed on a time and place (4 hours drive for me)
I agreed to buy it without plugging it in
The seller agreed to all this. Never said: "if I have another offer", "you need to pay NOW to make sure I don't entertain other offers", etc.
At that point why was I turned down when someone else made an offer? Why wasn't I asked: can you pay, I am waiting for your response.
For the record: I conduct myself with the priority of treating others the way I hope to be treated. I would NOT screw a buyer I agreed to meet with in such a manner as described above.

