Very true. I noticed this with an iPhone app I developed. It was a sports app and I manually updated things like results and tables throughout the year. The app sold well at 99¢. As it was a sports app and required regular updating (not to mention the feature updates I regularly put out) I decided to create a new app and charge for it again the following season. It had some new features but the basic functions were all still there. The number of horrible emails I received was crazy. A lot of people got angry, ignored my explanation, and told me they would use a competitors app (fine by me). But I was genuinely surprised by a few emails personally attacking me and telling me to 'fucking die'. I did this for a few years and the solution seemed to be doubling the price. Revenues didn't drop away but the pathological customers certainly did.