I find that the best thing to do with a pathological customer is kill them with kindness. They end up being your most ardent fans. If you can turn a non-paying

I find that the best thing to do with a pathological customer is kill them with kindness. They end up being your most ardent fans. If you can turn a non-paying fan into an advocate, they are much more valuable than a paying customer (well, most customers anyways.)