may not be directly correlated to financial success but they are priceless assets when it come to figuring out the world and those who populate it.
Clearly, most of those who are financially successful have connections, who help them gain entrance into the industry or field where they achieve success, or they are simply in the right place at the right time. Many of these may even have to work hard to achieve success. But, and I think you're right about this, good study habits probably don't figure highly in the requirements these successful characters need to find their niche.
In fact, good study habits might get in the way of the social networking often required for success. I suppose that those inclined to over-thinking might not be best prepared to make the cut-throat decisions that are good for profit. It may be better for business for one to know the latest sports scores than to understand philosophy, history, or politics (subjects which are taboo to talk about with prospective clients).
Still I wouldn't trade the things I've learned and the perspective I've gained, from constant reading for any riches in the world.