leon doesn't know markets are non-uniform and misrepresents my words, no surprises there. /ignore
spyman, looking at it that way, I think there's one more criterion to add to the ones I listed, which is 'significance to the original culture'. With that in mind, looking at dreads...well, my hunch is that it's generally below the threshold. I don't have a good handle on what the significance of dreads is, but what I know suggests it's a variegated cultural tradition that got bottlenecked through one or two focal points in the '70s and '80s, and its significance is not particular to American PoC. J Random white guy wearing dreads isn't imitating Kylie Jenner, so the exploitation level has to be considered pretty low. Individual execution will always vary, of course, but...well, hunches again: someone who cares enough about their hair to do dreads probably won't fuck it up *too* badly. And ignorance? I don't know what I don't know, and I don't know what other people don't know, but I don't think it's easy for that criterion alone to tip the scales.
Again, though, not my area of expertise.