"Economists regard seigniorage as a form of inflation tax, redistributing real resources to the currency issuer. Issuing new currency, rather than collecting taxes paid out of the existing money stock, is then considered in effect a tax that falls on those who hold the existing currency.[4] Inflation of the money supply in the long run may cause—and, all other things being equal, will cause—a general rise in prices due to the reduced purchasing power of the currency."
The problem is the amount. Going by this page[1], there's a net production of less than 30 million dollars per day. Let's round up to 11 billion per year. The M2 estimate[2] of US money supply is 13495 billion dollars. That's a seigniorage tax of less than a tenth of a percent per year. It's also less than a tenth of a percent of US GDP alone.
