This was the biggest (1) complaint for me - in light of what you discovered from your actual support experience, why was your expectation so off?
Was it that you expected support to be full of "how do I do this complicated thing?" questions that can be answered by an expert? That's an unrealistic expectation, but I guess now you know.
Or was it that you really thought that customers would be happy if you just took the time to explain your pricing model to them (also unrealistic).
It is kind of obvious from the types of emails you get, and the types of responses you give that it was not going to lead to strong customer relationships. If all you're doing is writing a 100 words to say "No, I'm not going to do what you want" that's not going to make things better.
(1) Actually 2nd biggest - the biggest was talking about "buying Castro" but having no explanation/links about who the author is, what Castro is, or how/when/why it was bought.