They don’t tell you this in Bio 101:
Ars Technica, The Tenure Track Not Taken:
Becoming a university professor requires a lot of work for very little financial reward, compared to most other professions. In STEM (science, technology, engineering, math) fields, the minimum requirement is four years of undergraduate education, plus anywhere between four and a half and eight years of graduate studies, followed by an (ever increasing) number of years of post-doctoral work. That may get you an assistant professorship where, at a state university, the starting salary is in the $60k-70k range.
(The only other career path I have seen that has similarly low pay for exorbitant requirements is becoming a chef. In both cases, you only do them because you simply love doing them.)