Some of these regulars may purchase a lot in one visit and not visit again for a few months. On the other end of the spectrum, you have regulars that visit more often and purchase a smaller amount. And sometimes you get customers that spend a lot regularly.
For these customers, what really make the visit, is the service given. When you walk into a store and a staff knows your name, immediately knows what you like and are willing to spend the time attending to you. Above all, the discussion between the staff and customer would vaguely resemble that of familiar acquaintances.
Interesting thing to note though, more regulars don’t mind waiting to be attended to by the staff of their choosing. I have come across situations where the customer turns away assistance from an unfamiliar staff only to wait for the staff that they are familiar with.
What it comes down to is that customers would feel that the service given was personalized to their individual tastes. They trust the staff and their suggestions. The staff knows what boundaries should not be crossed, as to not offend the customer. And most of all, the customer feels comfortable.