Same when I found out several of David Finch's students became professionals already. Erick Grove, Tomic Art, and that one kid who was on Dave's livestream all reached professional level art within 2-3 years.
Truly, the biggest thing that holds people back is the lack of a good study method. That's why people who are mentored by pros, people who attend a good school (Watts Atelier, Brainstorm, CDA), or people who are in their 40's and have lots of life experience, are the ones who can learn a skill the fastes