It costs about £100,000 to train to become a doctor in student fees etc yet wages start at just £22,000 a year
Education to go into the healthcare field is expensive here (US) as well. Nursing school can be as inexpensive as $25000 or more than $100,000 (depending on public/private schools). Pharmacy school is well over $100,000. And, a medical student probably spends (or his parents or a scholarship does) $200,000.
However, a nurse easily earns $60,000.
A nurse practitioner (extra schooling beyond nursing) and is the usual "GP" or "primary care" person now earns over $150,000.
A pharmacist (BTW a pharmacist, even a "Doctor of Pharmacy", cannot prescribe drugs here in the US -- only a physician or nurse practitioner can write a prescription) earns well over $100,000.
But a physician earns easily $250,000 to million$ if they are the top of their field (ie, cardiac surgeon) at a teaching/research hospital.