@Evangelicalhumanist I think looking at the issue as one of incentive is a bit simplistic. At the very least, there seem to be two kinds of incentive that could be discussed here. There is, for instance, the internal incentive that someone might have to fulfill through their occupation some felt need of theirs. Think in this case of a musician who feels a need to compose and play music. Then there is the use of incentives to compel people to work at jobs that they might not enjoy but which are necessary to their survival. I find that capitalism excels at providing incentives for people to work at jobs they dislike, but which are necessary for their survival. It also seems, on the whole, to reward some people who doing what they want to do, but I would submit their number is dwarfed by the people who are doing what they'd prefer not to do.
Stephen Gould once said that what interested him more than how Einstein became a great physicist were the countless "Einsteins" who lived and died working in the cotton fields, the factories, and the coal mines, unrecognized for what they were. Capitalism has proven to be an imperfect system for maximizing human talent. But, in all fairness, I'm not sure if any other system is much better than it.