Asking Ain't Getting
What sellers want versus what someone is willing to pay are two different things IMHO. We all have seen "vintage" appliances sitting on eBay, CL, estate sales and so forth because the asking price was simply too far divorced from reality.
Truth to tell even when those wonderfully elusive *NIB* vintage items turn up that some sellers think are worth $$$, it does not translate they will work right out of the box and reamin trouble free for years. Some do and then again some do not; that is where someone either must have the skills/knowledge or find someone that does in order to set things right.
Over the years more than several NIB or nearly so items have passed through this group. Some went for big money (a pink Maytag set IIRC still in boxes, ditto a Philco Bendix), others for average prices. More than a handful of "new" wringer washers have been on eBay or elsewhere that failed to sell or sold eventually.
Four grand is quite a lot of money to ask even for a vintage washer and dryer set "serviced" or not. Now if they were NIB and came with several boxes of spares, had been stored in a clean, dry (but not too much so) environment, then maybe we could do business. Not 4K worth but perhaps....