As a developer, I WANT to be on the support end. Even though I try to anticipate things like missing required parameters, etc. there is ALWAYS someone who will try to do something that I didn't envision. Sometimes it's another condition I need to test for, and give a useful message back to the user. Sometimes it's for a good reason, and I am pleased if I can provide that functionality. I work in a small group, so avoiding support isn't an option, but I truly enjoy it.