Wildly not worth the hassle. A lot of that stuff goes straight to Goodwill or in the trash. Tape decks are barely worth anything non-working, and belt kits are expensive and slow to install. Assuming the majority of the "good stuff" there doesn't work, you're gonna be going through a ton of hassle. I think you could clear $800-1000 overall but your hourly rate would be minimum wage or around there.
That said, if I were local, I would take a look and probably offer $200 or so.
That said, if I were local, I would take a look and probably offer $200 or so.