The 10% rule is a clever idea to even things up. Let the individual's own selfish motives work to acheive the greater good...sorta like the concept of capitalism. I wonder if it works as well as capitalism does.
Exactly the same thought occurred to me - can be generalized even more. Regardless of the system, eventually the brightest or most able will find their way to the top.
It is, it was, and will always be survival of the fittest - however you camouflage it, and whether you find that offensive or not!!