Shares of O'Reilly Automotive (ORLY -2.25%) have risen more than 200% over the past five years. They have gained over 400% over the past decade. And over the past year alone the stock has rallied 25%, handily beating the S&P 500 index's (^GSPC 1.11%) gain of just under 10%. Given that stellar stock price performance, it is understandable that investors might be looking at the auto parts retailer. But is O'Reilly Automotive a millionaire-maker stock? Here's some things to consider before you buy. In other wo ...