The traveling “cash” buyers pay very little for sweeps and scraps.
They areable to take advantage of the fact that a refiner does
charge you a refining charge, which can be significant if you are
sending smaller amounts, and the fact that unlike the check, or gold
credit a refiner may pay you, the cash payment is a handshake, under
the table transaction. You usually are paying dearly for this
"service", relative to what you are going to recover if you do send
a volume sweeps to a refiner.
I usually accumulate sweeps and dirty scrap for several years, and
then send it all to a refiner at once, when I have an upcoming major
expense, like new shop tools. Pay the essay fees, pay the taxes.
you will usually be far ahead of what a cash buyer offered you.