Sure, it's a ridiculous price for that particular 'table. However, prices have been climbing up on a lot of the better vintage decks. The seller is obviously knows prices are going upward, but doesn't know enough about the market (or turntables, apparently) to accurately assess the value. The issue is that if the number of potential buyers in the market keeps increasing, and considering that there is a finite number of vintage turntables, the buyer may eventually get that price. It's just supply and demand.
Agreed except for the bold part. He probably fully knows what the past assessment value is, but it only takes one "OMG I have to have that!" to get his price. If he is willing to wait it might be worth it to him.
Market prices are definitely rising here, but I still see what I consider exorbitant prices on stuff. For me, I price fairly though higher than "scroe!" prices as I always add value and research my items. I could probably easily sell my SL-1200 MKII for $700 locally in just a matter of days but instead chose to sell an SL-1800 MKI for $300 though it took weeks. I'll hold onto my 1200 and my 1700 as a rainy day fund.