could be - if someone wants to take it on. i've been through restoration on old cars. it's a lot of work, and it's not cheap.
i wouldn't pay $5k for an early bus that was missing its camper interior. i wouldn't even pay $3k for it unless it was damn near perfect in every other way. and in any case, old cars - even our beloved volkswagens - are only worth what someone's willing to pay for them.
it's extremely rare to get the money back out of a car that you put into it. the market just doesn't work that way.
i think your expectations are way too high, personally.