“You have no idea what you’re talking about”
30% bitcoin price change today:
https://www.coindesk.com/bitcoin-up-2k-from-start-of-trading-day/
bitcoin transaction costs:
https://arstechnica.com/tech-policy/2017/12/bitcoin-fees-rising-high/
The fee accrues to the retailer only when the retailer decides to convert his bitcoins to cash. Something that will happen less and less in the future. The retailer always has the option of just spending his bitcoins business to business, or saving them, or spending them at another retail establishment.