This is actually a good idea. Some small stores near my place is actually doing this to promote crypto and it feels awesome to see a Bitcoin logo every time I pass by that store. Unfortunately, I haven't tried it yet since I'm on the hodler side and I keep my BTC in exchangers I trust, not in my wallet 

It's good to have another payment option that's different on what we often use everyday, and I find cashless payment convenient every time.