As an anology, think about a superintelligent alien coming to earth with advanced knowledge that corresponds to his known environment or planet. He could get to earth and electrocute himself on a power line or get hit by a train or some similar fate, solely because he lacked the critical KNOWLEDGE of the fact that humans have created a system of electricity and transportation on this planet that is different than his. Only experience and knowledge can make one fully aware of a subject and able to succeed in that subject while avoiding pitfalls.

Therefore, intelligence, when applied to learning the proper knowledge and wisdom of the financial world, will result in a more positive wealth building ability. (I use the term wealth building ability because obviously, the more capital you start with, the greater your ability due to the mathematics of interest).

Now I also think that intelligence migh also be a detriment to capitalism. For exemple if you believe like I use to that because we are living in a limited supply of good, we can only get richer while someone else gets poorer, especially in the case of investing in stock. In that case, being 'aware' of consequence of such can lead you to a change of lifestyle that doesn't comes against your personnal moral beliefs.

I also think that high intelligence while growing up, giving you a certain edge over the average person, will tend toward making you lazy, because everything is obviously easier for you. While other learn to work hard for getting the same result. In the long run, the people who have developped a good work ethic will get the edge on the lazy above average intelligent people.

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So while I'd agree there's probably a positive correlation between income and intelligence, I don't think the same correlation exists between wealth and intelligence.

Being intelligent is neither necessary nor sufficient for wealth, but it can help if you want it to.