Why do anesthesiologist have such a high pay and why is there not many people doing this job?

Anesthesia must be administered at just the right amount, or it may cause damage to the patient. Anesthesiologist can get even higher paid than Surgeons. There isn't many people doing this job because it is a very hard and job and you have to be careful with every patient. You have to have 12 years of college, but you can start working on the 9th year.

what are the choices?