Earlier quoted context omitted.
It’s a flat fee of 0.000025 and takes about a second for payments to go through on current gen blockchain L1s, many of which have retail Point of Sale systems.
You are failing to price in counter-party risk, exchange rate risk, and myriad other risks. Not to mention the cost of having a whole separate point of sale for a currency nobody has - or the fees for converting it back into a currency you can pay your suppliers and taxes with. Or the cost associated with reporting. You can pay a very similar flat 1/3 of a cent fee for an instant FedNow payment with none of those ris…
0.3c is still far in excess of 0.0025c but maybe that won't matter.