Well, I run a number of apps that have users who appreciate them (I hope?) and they simply wouldn't exist without AI giving me the leverage to build them. So.. yes? What's a "return", anyway? It's worth it to me, obviously!

But you might have hit the nail on the head - yes, it's extremely fun and maybe that's the main reason after all. And FYI many, many people pay a lot more than $1k/m for video games.