"I had one email suggesting my book should cost $5 instead of $47. If I sold at that price, my hourly rate would be a couple bucks an hour. However, some people just have a sense of entitlement, or simply like to get things on the cheap. It’s best to ignore them, and focus on the people who are happy to pay for the value they get."

So true. Cheap customers also tend to be more of a drain on your support.