I've purchased from these fellas, it was an extremely nice original MB. They are friends. They work in the same area, and do see each other regularly. These are stand up guys as far as I can tell.
I don't know them personally, besides our singular transaction, but in no way do I believe they are trying to solicit bids. I believe it was quite plainly explained that someone is interested and they wanted to see what price jives with this unique machine.
My wife loves her MB. It is gorgeous. Thanks guys.