what if i don't want to purchase a smart phone and then incur monthly charges to keep that cell phone working Patriot .
Then don't go into business. That's literally as stupid as saying "I oppose cash - what if I don't want to purchase a cash register and have the cost of maintaining it".
You're not exactly in a position to call something "stupid" after that turd of an OP you laid here.
It also would eliminate buying that lawnmower from your neighbor or a want-ad, leaving a tip on the restaurant table knowing that the waiter will get it, busking or to playing for tips or a percentage of the bar, running a legal cannabis shop, and making any transaction at all when there's a power failure or system failure, among other things.
Hell I get cheaper gas by paying cash. They do that because it saves them processing fees.