On one of the later shows, Dark Matter or MITD there is an episode where near the beggining of the show Art says, implies, that he is selling the compound/the place in Pahrump (Compound - my word) He throws out the price of 5Mill as he describes the layout of the property, off grid home, and many other features that refer to the other structures on the property.
Essentially 5,000,000 for an outdated doublewide on 5 acres with a bunch of things that were completely suited for him. An eccentric multi-multi millionaire who happened to be a mega-fan would buy this but surely nobody else would even consider such an investment.
One (this one) wonders whether or not he was contacted by a potential buyer. Either way it was never sold.