My local yards classify primers and cartridge cases as “dirty brass”. I get about 1/2 the price per pound as their “clean” brass.
“Dirty” or “clean” referring not to actual dust or dirt, but any coatings (nickel plating), impurities/inclusions (valves and fittings with build up of whatever was flowing through them, or different metal types, plastics, rubber, etc) inside, or in some way not removable from the brass scrap.
I don’t take it on very often, since it’ll take me a couple years to fill up my scrap brass jug with spent primers and unusable brass cases, but, when I do, it’ll buy me lunch, and a couple boxes of bullets or bags of new brass. Worth the effort for something I would otherwise be tossing in the trash.