https://www.federalreserve.gov/faqs/currency_12771.htm

A 100usd bill costs .17usd to create.
That is a 99.83usd profit on every bill.
No a bad margin, if you can get it.

Coins are bought at face value.
Every dollar of coins in your jar is one dollar out of the banksters' pockets.
IF everybody got 100usd of coins they would be on the ropes, imo.
Maybe they would miss some margin calls.