In reply to Ava Adore:
Without meaning to be facetious, I think the best indication of whether they're saleable is whether anyone will buy them. :O)
If they look and seem to be in good nick, and you know they've not been abused then they're certainly fine to use so why not? Looking at the 'sold' listings on ebay it seems that 'as new' C4 Camalots go for about half the price of a new one, so i guess a bit less if they have a few superficial signs of wear & tear. Couldn't hurt to stick a 'for sale' post up on here...
Sorry to hear you don't climb outdoors any more btw.
Post edited at 12:42