Intelligence already likely correlates well with being a stubborn bastard. It helps with the part where you obsessively study topics everyone else thinks are too boring or inaccessible.
Most of the most intelligent people I know are actually pretty bad at monetizing that, though, in part precisely because they're way too distracted by the constant drive to learn new things (rather than picking a few and building a solid market niche), and in part because many seem more interested in the mental challenge of understanding something than the actual profits from monetizing that understanding.
