I think there's some nuance to it, mainly based off how well off the person doing it is, but overall I'm opposed because it drives up thrift store prices. Maybe it's just my area but all the thrift stores have been going downhill/gentrify-ing for the past decade. Was Macklemore's Thrift Shop to blame? In part probably, yea.

I still thrift because that's how you find old stuff that's well made and not just plastic crap but the prices have been climbing.