People often start studying of psychology due to a desire to understand human nature and shape social contexts. However, the choices made while planning these studies will set the course of your future career as a psychologist.
Many postdocs are academic staff working at a university or research institution. Their salary is not generous, but much better than that of doctoral students.
A doctoral degree will certainly only help you to become rich in an idealistic sense. The first contract for a PhD position should have a term of at least one year - after which, graduates are rewarded with their first salary increase.