Easier to buy a electric scrap melter and make your own molds, especially if you plan on doing this longterm. Or build a jet furnace and buy a crucible.
You do that and you immediately lose “recognizability” which means that a sale implies an assay, which is north of $100 per “blob”. Any of the popular gold coins can be tested using a “Fisch device” which is a simple and inexpensive device that virtually any frequent buyer ought to have.
There is ZERO advantage and plenty of disadvantage to “melting down” recognizable forms of any metal characterized as “bullion”. Melted down, the metal is likely to absorb contaminants and just ends up being less fungible.
I say again, there is no format nor manner in which you can TOUCH metals and not get stuck with at least one and usually TWO “frictions” unless you are a dealer and buying (from a consumer who needs the money) and can charge a buy spread on the sale. It is immutable, inescapable.
“Frictions” can be:
incoming freight or insurance
pay ask vs bid
getting defrauded on (at least) one out of a dozen deals; either getting bogus goods or never getting your goods in the first place.
Need for an assay that you have to pay for
storage fees
transport to/from storage.
There is no transaction possible for the retail bullion buyer where you do not get hit with at least one of these and it easy to get hit with three.