Seems like a lot of work for 20-30 bucks a pound.
But then this was 25 years ago that I was doing it, and $20-$30 was worth a lot more back then, so maybe it was worth the effort.
I know a lot of the NICE eBay coins are fakes. Look like they just came off the anvil on a polished flan, not buried for centuries.
The Roman bronze coins don't typically look very great after 1500 years in the soil. Those the ones that are legit in a lump of concretion. Silver and gold are generally pristine (after careful cleaning) and would only end up that way if they were among the bronzes. The question then becomes, would someone just keep the silver and gold for their skedaddle, and hope to come back for the bronze?