If I'm on holiday for example, yes it matters to me a lot. I like to mentally feel in touch with the area, and part of that is local foods and products. If it's not made there than I might as well get it in a shop back home. E.g of I was in Cornwall and bought a home made pasty that was made in Taplow, then I'd rather shop around for a local one. Even if they've used imported raw materials, the local methods and traditions of how it's made is part of the appeal
I've always tried to shop where the locals do, when I'm on holiday. And it's nearly always smaller, long established shops when in the country.
I've a simple system where I'll use them/their shop until they give me reason to think otherwise. I'd one shop I refused to use, which was also one local garage. The owners set up with the stated intention of closing every other local shop down. At one point all I got from there was the free air, until he tried charging me for it. And a rep asked him why.
I've given the shops I do use the English money I've had, when it's the only cash I did have. Telling them to take it at face value, nearly always at a slight loss, but I'd have to get it changed at a bank, when possible, and lose some then. When the £ was worth less than the IR£, most of them took it at face value. Only one didn't and even tried charging me for using it. I left the stuff on the counter, taking my trade and goodwill elsewhere.
I understood that the shop owners would be charged for changing it, hence the face value part. Some of those shops shut after their owners died, with no-one to take over it. But the majority are still there. I didn't try to take them for a ride, and the majority returned that simple piece of trust.
I might have been the visitor from a big town, but I didn't take them for a ride. Insisting on the exchange rate, which seemed to strike them as odd, but a fair customer.