What are you talking about? Complexity is more enjoyable for some, not all people. And the joy a game brings is subjective, not objective. You can't measure game-quality by saying this has x rules more than other games, so it's objectively better.

> we would only see more and more complex games. We don't

Not true. There is a rise of complex games in the last decades, especially in digital games. But it's still a relative small market, so the number of casual games are rising significant faster, distorting the impression on surface. And there are also several constraints which influence this rise. You can't measure this by simple binary logic.

> What makes more money

Money is an irrelevant metric for this.

And we are long over the point were complexity in moving pictures was a thing of movies. It's now all in series, and the complex sh*t is on netflix, prime video, etc.