>>6001284Its like anything, once purchased and used value drops drastically.
I keep some items still in boxes, mostly for safe storage though, some have been opened, items inspected, put back in, and some I've sold too.
But I think you'll have some sort of mental issue if you think hasbro products (black series, retail transformers, marvel legends etc), mattel goods (apart from hotwheels/ matchbox but only to other collectors), anything funko or practically from regular retail is gonna be worth good money in the long run unless it has a limited numbered run.
Hotwheels used to be easy until they upped the numbers of their treasure hunt/super treasure hunt releases, now you gotta look for errors and hoard them until you're a grand parent, and if you don't have kids no way would anyone logically live long enough to make a decent profit off current day molds.
Can't say shit about Japanese goods but those things seem to retain high as fuck retail value