$19.3 million. That's how much money you'd have today if you bought$10,000 worth of Amazon (AMZN -0.59%) shares at its IPO in 1997 and never sold. Could you make a 1,930-fold gain over the next few decades by investing in Amazon? Probably not. However, I think the stock will remain a big winner. And there's one most compelling reason to buy Amazon stock right now. Good reasons to buy Amazon stock Don't get me wrong: I'm not saying there's only one reason to invest in Amazon now. I can think of quite a few ...