The value in the us is moot if you are still in spain. The buyer from the us still has to pay to import it and go through all the headaches that come with that. If he was paying us prices for it then why bother doing all that in the first place?

Pity. Honestly I would be interested, but for the shipping part.

As a buyer I have to figure out a way to pay you. Arrange someone to get it out of there and onto a ship. Get the paperwork done to get it through customers here. Arrange it to be shipped from the dock.

This is all supposing you are an honest and stand up guy. That the machine is in the condition you described. That nothing happens to it in transit from your place to the docks there. From the Docks there via ship to the docks here. Gets through customs without incident. Gets loaded onto a semi here and to my door. All this without anything getting wrecked, stolen, or you pulling any funny business.

That is a lot of headache and grief for a machine that if in decent shape and working is worth 4k here. All that shipping will not be cheap. Then you have to figure out what the risk/grief is worth. So I just cannot see anyone willing to pay tons of money despite it being relatively rare in the us.