His shop his rules, having said that he would only try it on with me once, he would fail and I would not go back no matter how convenient the store was!
I suspect the shopkeeper knows the difference between his regular customers, who may drop in for a paper every day, and those who only call in to get change for parking. The latter are, almost certainly, one-offs and he won't care about losing a small one-off sale. The former, I expect, will still be given change.
If this statement is true, he doesn't need the custom - small purchase or not.
//The 33-year-old, who runs Jack’s News & Booze, a convenience shop in Halesowen, claims around 100 people every day used him to get change for bus stops and car parks.//
Multiply that up and he's turning away a lot of small purchases.
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