My answer to the question, if I'm understanding it correctly, would be simply, that if a vintage kit appears to have been well cared for, I believe that it could command a greater price to a collector. Personally I enjoy restoring and cleaning up old kits, but I'm also on a budget, and have some time to devote to it. It would seem to me, that there are probably collectors out there that have more money, than free time, that might be more receptive to dropping some bucks on a well maintained, and preserved kit. Sure, there's bound to be signs of age, but you take your chances when you buy an old kit that has obviously been around the block and has layers of crud and corrosion on it, though the bottom line I think, is still what era, brand, and quality the kit is regardless. Can't honestly say for sure - just my opinion.
If by, "refinished" you're referring to being re-wrapped, then that is another subject entirely.