I don't know if the reason they always find some other thing that you could do better is because of money. I think it's more likely they want to feel like they are helping/contributing to your self-improvement / feeling better / stronger marriage or whatever. After all they'd probably make more money if you stayed sick and in therapy forever.

Mostly though there is a real limitation to what therapy can do. A therapist can teach you new communication techniques, but if one or both people in couple's therapy don't want to improve their communication then there isn't much more that a therapist can do.

I really liked the Dance of Anger by the way. It gave me a new way of looking at my anger and I have decreased it quite a bit simply by understanding the feelings underneath the anger.