Home Depot's attention to one key customer cohort has been a smart strategy.With trailing-12-month revenue of $152 billion, Home Depot (HD -0.25%) is one of the largest retailers around. Expanding the store base has helped drive up sales over the years, leading to impressive shareholder gains for longtime investors. For example, had you bought the stock 20 years ago, you'd have generated a monster total return of 1,520%.Home Depot clearly dominates the home improvement industry. But I believe there might be ...