How things USEd to be is pretty irrelevant. I used to buy R60's and R69's for 5 or 6 hundred- and they were good running bikes. So what?
It's worth whatever you're willing to pay.
I sold a super low-miles GB500 with some goodies like a Pit Bull, new tires, manual, etc. for $5K. He gets home and says "his friend" told him he paid too much.
Bottom line- you're looking at an older bike. What's it worth to YOU and are you willing to take a chance on something cheaper coming along later? If you're likely to have buyers remorse, watch prices more, make a decision, and don't listen to anyone later. Don't even tell anyone what you paid.