Judging which growth stocks are good long-term bets is trickier than you might expect. These fast-moving businesses can be hard to forecast, and changes in their broader industries could quickly lift up (or sink) these growth names in short order. However, there is one metric you need to keep in mind above all else: profitability. This is by far the most important factor, a lesson I’ve learned the hard way.Investors should avoid scooping up growth stocks that are far from achieving profitability and don’t h ...