Saw the layout. I read the description. Too many caveats for me.
Sounds like you'll not get any help from the seller. The buyer is expected to pay, remove, correct any damage to the seller's home in the process. Doesn't include any trains. Doesn't speak of any condition/issues re the layout and its operation. No video showing action.
And were I to consider this purchase, I'd have to also consider that I would have to make all the arrangements, make the long trip myself...maybe with a couple friends to assist...supervise the movers, etc., etc., etc..
All of the structures, vehicles....anything small and loose...would necessarily have to be removed, wrapped, packed beforehand. The layout would have to be cut into moveable pieces, probably destroying much of the nicely done scenery.
If the movers are not familiar with or prepared to move this sort of load, I would expect a lot of shipping damage for that distance.
All of this would have to be reconstructed upon arrival at your location.
To top it off, the seller seems quite disinterested in it all at this point and is willing to take less than the posted price. This is not a good sign, IMHO. The layout maybe hasn't been run in a long time. It really isn't worth the asking price to the seller. They want it out...period.
I would more seriously consider using the money you'll spend...layout, travel expenses, moving expenses, insurance, repairs, reconstruction, etc., etc....on construction of your own layout...with the help of friends who, I'm sure, would rather not have to go through such an ordeal.
Finally, I'd try to establish a line of communication with the seller about the layout and the move, the caveats. Compose a list of questions. Get clarification. (Do you even know that there is a reasonable basement access for a mover to carefully extricate the layout in the largest possible 'chunks' to be loaded into a moving van??? The mover, certainly will want to know this before agreeing to such an unusual request!!).
You'll learn a lot about the seller and the layout from direct communication. If they're put off by a list of questions and details as mentioned...as well as your counter-offer $$$...you'll get a better sense of how the whole transaction would transpire.
The ol' "Caveat emptor!" really comes into play in this sort of scenario...IMHO.
FWIW...
KD