At most DZ's I've been to, the local WSers are quick to come and at least have a chat with and probably want to fly with you. At the DZ's without much of a WS scene everyone is crazy cautious about what you're doing and how you're doing it!
A wingsuit is just a wingsuit. People will continue to be interested in them and may want to purchase older/cheap suits as a motivator for themselves to get into it properly, as a costume, as a research tool, or just to keep it on their sofa to impress unsuspecting (and unfortunate) girls on a Saturday night.
If they want to use it they are going to need a sky or base rig anyway and I honestly think there's enough 'ethics' in place already for selling that gear that anything more is not necessary.
I'd be more worried about a new WSer getting their hands on a monster suit prematurely (or being given the hard sell on one unfairly) than a non-jumper buying old, ragged-out equipment...
