Obviously something is worth whatever you can get people to pay, but a decade ago these were the prices of 60s basses - I guess that is we have moved on a decade later, and there are a lot more year of birth basses in the 70s now then the 60s, and 60s have gone into wall hanger territory.
There was a 76 jazz bass round the corner from me the other day for 2k, looked in good condition, but with the london shops and reverb pushing much higher prices for 70s basses, it sort of normalises it.
I guess my real problem with the 70s fender jazzes etc is that it is hard to get round the common knowledge of when I was starting that you didn't touch a 70s fender unless it was cheap (and they were very cheap)