I don't know - IMHO I wouldn't say that SPF Slabside is ridiculously overpriced. That is a really nice car and except for the body material, very faithful to the originals. It's priced significantly under what he has in it as the original owner which reflects these replicas will seldom be worth what it costs for the initial build. Assuming he has a little room to move on the price, if I were in the market for a slabside I think it would be looking at it closely.
Obviously we have different ideas of what things are worth....or are in very different tax brackets.
And I don't care how much he overspent building it, I could build two ERA Slabsides for that.