JT has a cult following. I'm part of it... or, rather, sell to those that are. I searched JT in hopes of finding some chump who doesn't know he's sitting on a goldmine of JT parts and pick up the lot for significantly less than market value.
However, WGP is no longer and sockhats are oldschool so it could be desirable to someone. I just sold a JT sockhat for $50 within an hour or two of posting it.
I would list it at $30 OBO and take the first offer you get on it. I have a NIB Pure Energy sockhat that someone offered me $10 for... So it could be your asking price or next to nothing. Keep it if you like it, but valuable? Not really.