How Storage got me interested in Machine Learning

I am amazed with some of the online shopping solutions around. How do they continue to attract people to their website and services? Some are like the Dollar shop selling cellphone cables, mouse, dongles and many other things from as low as a dollar and with free shipping. How do they stay in business!! But then I look at Netflix and Amazon they can do just that, with a brand that they built and yet offer prices that are reasonable.