Shares of Chipotle Mexican Grill (NYSE: CMG) have been a truly wealth-building investment for shareholders. Over the last decade, it returned 440%, soundly outperforming the S 500 index. But some might argue the stock's recent run-up has left it too rich to buy.

Chipotle's current price-to-earnings ratio of 56 is well above the average stock's 22 earnings multiple. Chipotle has a leading online ordering business and a highly profitable business model that has helped the company sustain high, profitable growth over the last few years. Investors anticipate that its growth streak will continue for the foreseeable future.

On the flip side, the high price-to-earnings ratio leaves the stock more vulnerable to a steep slump if the business stumbles.

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Source Fool.com