My, how smug of you. Tell me, is there anyone else you'd like to exclude from things just to make yourself feel superior? I'll start a list for you.
The gradual devaluation of markets is a normal market trend that happens regardless of whether Reuse exists or not. As more supply enters the market it will eventually exceed demand and the price will decrease as a result. This is economics 101. Reuse may accelerate that process somewhat (though I'd want some data to back that up), but I doubt it's by very much.
A decent indicator here is treasure dungeon materials since that just happened.
So Indigo Cloth on my server started at like 600k a pop. It's at about 250k per now. Is that because Reuse exists and everyone's out there HQing their summer indigo stuff and getting mad procs (which would generate 1 cloth per proc)? Or is it because there are more people doing maps and more cloth just being generated by the game as a result? I'd say it's far more likely that option B is causing that more than option A, especially when the stats necessary to HQ that thing are non-trivial to begin with.