The post sort of begs the question. What's the alternative? I've found AA flights to be among the cheapest for me almost every time lately. Theoretically I would pay slighly more to stay on AA and get miles, but I have't had to.
So is there some magic airline with both better service and better prices. Presumably you're not talking about moving on to Greyhound and from what I hear UA is no peach either, and you ain't getting no meals on the LCCs... not sure what the threat is. If you really want to make an impression you should tell them which carrier you intend to switch to, and why. That might get you a real response.