It isn’t just employees. The manager/owner of the coffee shop I buy coffee from most mornings is very friendly - I’m sure part of this is just her personality, but it is also good business sense - there are lots of other places people can buy coffee instead, and no doubt her friendliness is one of the factors that keeps many of her regular customers coming back. And this is Australia, so no tips involved-it would feel weird and embarrassing even to offer one.