I have never used bitcoin as a means of direct payment. because my profession or job makes me paid with ordinary money.

But I am interested and like your suggestion or your story about asking the shop owner directly about whether or not you can pay using bitcoin. Because I also think that there are actually a lot of shop owners who are familiar with crypto or bitcoin in particular. But certain situations keep them from making the bulletin board accept crypto/bitcoin payments. Maybe I'll also try asking the shop owner if he knows crypto and accepts crypto as payment.