Peter T. Daniels wrote:

Benefit? There's upwards of a billion Presidential Dollar coins
sitting in warehouses, because Congress mandated that vast numbers
more be minted than there was a collectors' market for; they shipped
them to banks, and eventually the banks shipped them back. (I've never
seen one. The last time I used a p.o. vending machine, at least two
years ago, I got both Sackies and Susan B's.) Just the storage is
costly

You clearly missed the mess whereby people could order the coins online with
free postage, which was intended as a way to get the coins into circulation
by allowing people on the ground to obtain them, in the hope they would go
on to use them and breed familiarity. Instead a lot of people just purchased
by the suitcase load on their credit cards to accumulate air miles then just
took the coins to their banks to pay off their CC bills. Eventually they
stopped credit card purchases.