it's a dutch auction, by mistake
I emailed him (her?) to let them know they have a dutch auction going, and could end up with two winners. We'll see what happens. If it ends up with multiple last minute bids he could have a mess to deal with with deciding who gets the items. Local pickup only could mean one bidder shows up. If I was local I'd contact the seller and try to see the items in person before bidding.
as for values and supplies.....here's my 2 cents....
Total numbers produced don't matter. There's a Marantz 7 preamp up for sale every week, sometimes 2 each week. They still keep climing in value. Thousands were made. Not a few thousand, but over 10,000 at least. Same for the Garrard 301 turntable. What matters is if the number of potential buyers is increasing faster than the supply - not the number made, but the current supply. Then prices climb. Places like AK help to educate buyers and increase the supply of new buyers. Websites like the Classsic Marantz, Silver Pioneer, and thevintageknob have all had an impact on the educating buyers to classic audio products.
IMHO rarity does not always equate to valuable in the vintage audio game. I have a Kenwood KR-7200 (TOTL 1973) receiver that almost never comes up for sale on eBay. Yet I don't think it's worth more than $50. People have to want to have it for it to be valuable.
It almost doesn't matter if Sansui made 50 or 5000 of the G22k, what matters is if there are 5 or 50 buyers for the 4 or 5 units on the market.