I've been on the same end where I have gone to purchase a machine only to find when I get there to be being loaded into anther guys truck. Shitty on the owners part for having multiple parties come out at the same time. I wasn't mad with the buyer, but I definitely had words for the seller.
And why is it a big deal if he buys it and puts it here to make a few bucks? good for him to score a machine at a nice price. Me personally, I try to make a profit on everything I invest my money in.