That's not bad actually, I get the going rate of 30ยข/kg for irony alloy.
You have to also consider the time and effort of separating vs submitting whole.
In one YouTube of a scrapper sending in copper electrical wire coated vs spending the day stripping them all with equipment he set up to make it faster, he worked out he gained $8 per hour for his efforts stripping them vs taking them in as is.
He thought it wasn't really worth it unless you really need the $$ or have the time on your hands and don't mind doing it.
