I've spoken to a number of shop owners who were staying open late - some didn't have a single customer in that time, and others only one or two paying customers. Yet they still have to pay staff, electric, etc., and this was during the height of the tourist season!
Yes it's inconvenient for people working 9am - 5pm from Mon - Sat, especially if their lunch is also 1pm - 2pm when many shops shut, but it's simply not cost effective to stay open later in those kind of situations. They gave it a try and it failed miserably for many!
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