> one of the more distinguishing features of a venue

It depends a lot on whether your customer base is made up mainly of one-off walk-in casuals, or regulars. Getting to know the regulars, and having a chat with them, can improve the feel of being in work for the staff themselves, as well as providing a more friendly and welcoming atmosphere.

The OP described this particular case as being in a small town, with not many other options for entertainment, i.e. a small captive audience. You could say the customers don't have much else to do so it doesn't matter if you're a miserable git, they'll still come. But just being friendly and chatty makes all the difference to a lot of people, and can help you build a loyal audience of core customers who'll choose your place over the few alternatives, will keep coming, keep bringing more friends and family, and sometimes even support your business in unexpected ways.