Probably because it takes so much money & time to get qualified as a psych doctor in general never mind becoming a specialist in a particular area, is why treatment is so expensive, lots of debt.
They also probably want to live the highlife aswell.
And all our yesterdays have lighted fools the way to dusty death
Out, out, brief candle! Life's but a walking shadow,
A poor player that strut's and fret's his hour upon the stage and is heard no more,
It is a tale told by an idiot, full of sound and fury, signifying nothing. - Macbeth