I'm not aware of any plug end buyers ... though they may be out there.
You might do a scratch test with a file or a grinder on those male plug ends. The ones i've found so far seem to yellow brass underneath with a shiny silver colored plating. I don't see many that are straight brass anymore.
I usually put the male ends in the vise and yank off the metal parts with a vise grip. I kinda use a rolling motion to the side to get em' free. Haven't found a good method for the female ends yet.
I don't bother with the computer power connector ends pictured at the bottom. Best guess is that they could be nickel -or- nickel plated to resist corrosion. They might be worthwhile if you could process hundreds of pounds of them in a hammermill of some kind to separate the metal from the plastic ?
Always wondered about the gold plated connector ends and if there might actually be more value in the base metal than in the plating.
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