I picked up an elderly, authentic mech that is absolutely BEAUTIFUL, I bought it for the husband thinking it would play to his strengths (he's an engineer) and tempt him, but it turns out he started vaping on a Nautilus 2 like everyone else. LOL.
I still have it, I plan to vape it (currently using my baby Ephro Armor training mod).
If you have ANY interest in mechs, I'd suggest hanging on to them and vaping them when you are ready, because honestly I PICKED up that mod at an absolute steal price, and that sort of tells me that well, I'm not going to be able to turn around and resell it for it's original worth or more.
Also if they're clones, forget it and just enjoy them. IMHO mech mods aren't quite antiques and desirable enough that unless they are some sort of limited edition thing, I doubt you'd get much for them.
Maybe once the FDA is done with us, they may have some sort of crazy resale value, but again, that would probably be ILLEGAL and honestly if you have ANY interest in ever vaping a mech, well, you may wind up happy you have them and etc.
Anna