Ernesto,
Trade them if you'd like to! I think that'd be neat!
From my end, here's what I'm doing with the limited edition skins:
The Hollow: I gave it out to IndieGoGo backers, and will be giving print copies to those going to the Fabricated Realities convention. That's it! Then I'm done with it!
The Selkie: I gave it out to IndieGoGo backers. But from this point on, it's in Jackson Tegu's hands (the designer of that particular skin). He'll be deciding whether it gets released in any other contexts.
The Serpentine: It's available on my website, for anyone to download. It'll stay there, as per the wishes of its patron: Christopher Murray.
So, those are my plans, so far. Feel free to trade as you see fit.
I thought it was pretty cool when some people said, "I'll give you this Apocalypse World playbook if you make a charitable donation to a worthwhile charity." Just, you know, for the record.