"The way to get rich is to put your eggs in one basket, but watch that basket very carefully. And make sure you have the right basket."- Jim Rogers
I think it's an interesting point. The whole notion of diversifying is to hedge yourself, balance a portfolio and see modest, constant returns. However, if the goal is getting rich he's absolutely correct that this isn't the right method. However, it does carry a lot higher risk.
http://www.businessweek.com/investor/content/apr2009/pi20090414_131044.h...