I also love these videos! So awesome to see different interpretations from really skilled people (as well as to laugh, seeing PS monstrosities).
I should say it also requires a lot of skill and practice. I am pretty sure that most of original artists spent years learning how to draw (composition, anatomy, perspective, color harmony, light and shadows, the disciplines are endless, really) and searching for their own unique style. That’s why they charge what they charge. Not for 16-18 hours of work (this is pretty average number, depends on how complicated the artwork is), but for 16-18 (or even more) years of learning and practice.
Drawing was my hobby for about 7 years. But only after I finished some digital art courses and was pretty sure about my skills, I decided to try freelancing. I still have a lot of things to learn and I try to spare money for more courses and programs which will help me grow as an artist.
And after thinking about this endless path of self improvement, it makes me just furious seeing how another brainless person decides to steal the result of all these years. I always flag suspicious gigs or send links to the artists I know, so they are able to flag them or PM them in person.