I've thought a lot about this, but there is so much critical context that has to fit into your thinking. And it depends on your goals. If you are super ambitious and want to change the world, only big ideas will do. If your goals are more about money or lifestyle, $50,000 / month is the same no matter how you get it. The older I have gotten, the less interested I am in the scope and risks of change-the-world ideas ;)

Getting that kind of money from a big corporate job, I would guess, is a lot more hassle-ridden than if you did it on your own. I also think the competative context is important to understand.

I actually have been experimenting with a tool[] I made to very quickly get an understanding of just how competative the marketplace is for a particular idea -- big or small. I have a million ideas, prefer the "smaller" ones, and prefer to enter where there is a real market opportunity.

https://already.dev