I think it depends on a lot of things. You have made some really good points and differences. I guess in every profession there is a percentage of greedy people and psychology isn't exempt.
Here in Ireland, psychotherapists do not make enough money to survive so it's definitely not greed, it's dedication and vocation that draws us into doing this work. I myself work full time in another job and even though I am fully qualified and more so than most therapists I know who only have diplomas, I still have to work full time in a job that is nothing to do with what I have trained in, I am expected to work voluntary even I have paid so much for my education without any grants or help from anybody. So I personally don't think that psychotherapists are greedy.