Mine, kill bosses, build farms, kill more mobs, basically if you kill enough of anything you'll get better gear and resources you can use to craft better items and progress to kill more bosses. Plus there's a ton of cosmetic items.
My family was never really supportive of me and my sibling is just a brat. I don't really care too much for them, but I will help them out occasionally.
For developmental purposes, it would assist the developer greatly in writing text or composing images. But I think it would take a decade or more before we see AI make a game completely by itself.