This is a very cynical viewpoint and I simply don't agree with it as a rule.

I think in any caretaking field there is burnout. That happens to teachers, nurses, doctors, and yes, counselors.

Some therapists know how to counter it and some don't but it's up to the individual, not a rule. I've met therapist who has been in the business for YEARS, about ready to retire but is still amazing and very good at her job.