Not to Chang the subject, but are the scale Atlas wood sided referes worth anything anymore?
They seem to sell quite well. A lot depends on which ones they are, of course.
You may be asking the wrong questions, though. Noone should purchase, or keep, cars based on what they think they're worth to others, at least in most cases. The main thing that matters is what they're worth to you. If you like them, buy/keep them. Otherwise, don't buy/sell them. Don't worry about what you think you'll get for a particular car. Besides, what an item sell for depends on a lot of factors the seller has no control over.
If you want a general idea of what things are selling for, look at auction sites, like eBay.