Interesting recent situation on this topic. A friend at my model railroad club is getting out of wargaming. He seems to be keeping his painted stuff and hobby supplies, but he gave me $500+ of unbuilt WW2 stuff, mostly Rubicon. Only request was that it gets used. Last night I distributed it for free among those of us at the wargaming club who are interested in K47. A boon of new kits is a kingly gift, but if it had been leftovers, painted stuff, random figures, etc, we still would have been glad to take it.
Whether the charity shop or a club, there's always a taker for free stuff.