It absolutely depends on how often you use it. But if you leave it, I can almost guarantee that you will get a lower price for it, even if you only used it once. I agree that, if you are using it regularly, you need to be honest about it
I imagine a lot of boredom (besides staying alive), helps finding out stuff. I can also imagine, that they had basic roles in a group, where people were designated "mess around with stuff and discover things, aka proto scientists"
Excuse me, what's that thing about the bunkers?