The thing about treating people like human beings is that it makes them feel valued, and it can come back to you in the most delightful ways. I always remember being surprised and delighted at getting Christmas cards from customers.

I've never been good at the Chrissy card thing, but try to make a point of giving chocolates or similar to staff of places that give me good service every Easter and Christmas. And occasionally other times if I'm cashed up and in a good mood.