I plan to make and market my own games.
That said, I don't think anyone here could actually pay $20 an hour for a good artist to draw and make good sprites, when there are packs available for a few dollars.
That said. Your time is worth a lot. The only way to make that much is to make your sprites and sell them. You can charge a minimal amount and if you sell enough, you can make much more.
I would rather sell a lot of games for a low price than one or two at a higher price.