TBH, I think comparing indie prices to AAA prices is a bit unfair. Since they sell millions of copies so even at a lower price point they can still make lots of bank. While many of us indie devs will hardly break 100 sales in our lifetime, so we gotta make every sale count.
I personally charge $30, but I have full voice acting, hand-drawn art, and eventual L2D animation.
But the fact OP is getting $50 sales on AI art makes me super envious, haha.
Sometimes at night, I think about switching over to the dark side.