OK, I would TOTALLY recycle my sex toys in the sense of sending them somewhere where they could be broken down and turned into something useful. I'm one of those people who admires the nice packaging on some toys but sometimes I'm like "Eeek, that's a lot of waste." And I'm a little ambivalent even about, say, the idea of accepting review items if there's a strong likelihood I wouldn't like them. I just don't like to have extra stuff.
So, along the same lines, I'm going to stick my neck out and say that yes, I would accept previously used toys. I really don't like porous toys, so presuming that a sex toy is made out of silicone, glass, or metal, I'd definitely consider it. It would also depend on what I knew of the toy's history. So, for example, if a friend of mine wanted to give me something and it was pretty sterilizable, I'd take it. Same with a toy that wasn't sterilizable but wasn't used for insertion. My Tango, for example, just doesn't get very dirty. It doesn't require lube and mostly spends time on my clit. If someone whose habits I knew wanted to trade me their Tango for something I have, I'd say "Fabulous!" and give the the Tango an extra deep cleaning, but then mostly be happy to have another Tango.
Likewise, I'd consider something like a silicone or glass swap if someone on these forums with whom I was familiar was passing them along. I basically assume that people who deal with sex toys a lot are also aware of cleaning guidelines and adhere to them, and I'd just sterilize whatever it was, however I could.
I'm not sure about toys primarily intended for anal use, even if they followed the same guidelines (non-porous, silicone, glass, or metal). I think it just bothers me less to think of a toy having been in someone else's vagina than in their butt.
So, yeah, sure, I'd accept nonporous second-handers, and I'd ask my friends if they were interested in me passing along toys that don't work for me.
I think I'd draw the line at re-gifting used sex toys, though.