I’ve been on the defender side of security my whole career. I know in some markets crime pays more than legitimate work, but it never ceases to amaze me how much thought, effort, planning, and engineering goes into providing infrastructure IT services for cybercriminals. The people involved definitely have the skills to be profitable at legitimate work; it just puzzles me that they choose to support criminals.
The US is unique with its high salaries for tech work (on the lower end of those of high salaries is pure ops work like this though). If you're in a country where the average sysadmin salary is substantially lower (to pick on Eastern Europe for a minute, you're looking at the equivalent of ~$30-35k USD/year), it's not hard to see why its tempting to go the cybercrime route.