Matching the past three decades' worth of gains would be difficult, but the stock doesn't have to repeat that amazing feat to be worth owning now.Most stock buyers already know Amazon (AMZN 1.04%) has been one of the most rewarding investments of the modern era. Shares are up a market-leading 275,000% since the company's 1997 public offering, reflecting its hold on an e-commerce market that's exploded in the meantime.As the adage goes, past performance is no guarantee of future results. The online shopping ...