Chipotle is still worth buying, but investors should steer clear of Sony.Many retail investors might shy away from higher-priced stocks that cost hundreds or thousands of dollars per share. Even though most brokerages now allow investors to buy fractional shares of those stocks, some investors might still prefer to buy round lots (100 shares) at lower prices because they're easier to keep track of.To reach those smaller investors, a lot of companies split their stocks to make them easier to trade. These sto ...