They're possibly just dealers who make similar offers to a hundred other people with the hope of getting one bite. I've had a few people (probably two) do that with me. Usually they send an email making a stupid offer then "reply if you're interested". I don't get annoyed, just don't reply.
Strangely the last two machines I've sold to men who want the machines for their wives as surprise b'day presents. Both had looked at the ad, called me, driven here, picked up the machine. The men had bonded with the machines! I shouldn't be surprised at that