Becoming an artist or illustrator is hard. It needs passion and dedication. You need to be able to not only imagine your character but use time and effort to make them appear on a blank canvas.

Many people lack time and/or talent to draw their alter ego. Today everything has to be perfect. A pencil sketch is not enough.

I can somewhat understand the urge. People have shitty lifes with shitty jobs. DnD is some sort of short time escape. They like their characters and story to become as visually appealing as possible.