The glory of this is only to be found by those hawking ceramic bottom brackets-- to those misguided souls who genuinely think that the steel balls and few dabs of grease in their bottom brackets are the only obstacles keeping them from averaging 20mph. I'm pretty sure I could replace my BB with a solid delrin sleeve and probably lose about 5W of efficiency.

But hey, people buy $150 uber-chains, $300 titanium cassettes, and $500 jockey wheels, too.