Opening bid is $8000 with a buy-it-now of $9000. Let's break this down: Assuming average condition for the 500 and 750, they might have a market value of about $2000 and $3000 respectively, while the non-original, more "used" 1000 maybe $3000, for a total of $8000. A more hopeful buyer might value them a bit higher, a more cautious type a bit lower. In my experience of buying old motorbikes sight-unseen, I would tend lower. So our seller is in the ballpark. We'll see if someone out there is in the market for an instant collection.
P.S. The listing mentions the Barber collection of VFRs. The photos below show what he's referencing. That 750 was the second bike acquired in this impressive museum collection.