Notice the words
mint condition.
Of course a trashed one is going to be a lot less. But '67's are worth a lot, esp. gt and if they're a fastback.
I've seen mint condition '65's and '66's sell for over 20k. They're worth it, but its hard for most people to believe or want to pay that much. I paid 6,400 for mine. And that was about 2k too much for it at the time, but hey. Its a damn good investment.