i previously tried to purchase a 20/- namkeen in an airport using card, they denied.
agreed, i was actually surprised the merchant accepted card for such low amount, and with that confidence I went to another store in the same shopping complex, purchased 130/- by tap, and funnily, went back to the first store as i forgot something and paid 122 by tap 🙂
yes, i saw some places which do this. for ex. a computer repair shop in my hometown where i had to go for repairing my company laptop. they had a qr code, pos machine & account details (for imps/neft/rtgs). only card gets the extra charge (2-3%) & i saw ppl paying the extra charge too.
another funny thing, recently went to a reputed gold brand store. purchased an item of <50k, i said upi as payment method, they were literally begging me to pay through card. i even denied having card, still they were saying don't pay through upi, it might go into processing state, etc.