The Adventure League is done with D.M store credit, but I know that is not what you are really asking about...
I have not done it, but I am told it is getting quite common for online games.
I have a couple of cautions though.
I think I am a great Dungeon Master, but I think a big part of what makes my games successful is I choose players that mesh well with my style. I don't doubt there are players, perhaps many players, who would not find me great.
I am a very solid miniature painter. Decent enough to command solid money for my work, and I have done commission painting in the past. It burned me out - charging money and the expectations that went with it sucked a lot of the joy out of painting. I had to weigh whether that last level of highlighting or detailing on the base was worth the time vs. money. I went back to just painting for myself and enjoy it more than ever.
Not saying that will happen to you - just a couple of things to consider.