Amazon got it for a couple of reasons
1) They were the first mass marketed e-reader in the US. Yes the Sony was out there but how well was it advertised? Amazon had the Kindle on the front page of the Amazon website for many a year.
2) They had a book store that worked. Heck, I remember promotions with the NY Times that essentally saved you enough money to pay for your Kindle with the money you saved. And then there were the $9.99 books. And a book store that actually worked and was growing quickly.
3) Internet connectivity so you could buy books any where. They were the first on the US market with that.
They had the US market for a couple of years before BN introduced the Nook. So they were able to build up a clientel, one that wouldn't want to move to the Nook because they couldn't move their books. Then came Kobo several years later.
Sony did crap to promote their e-readers. They didn't keep pace with Amazon on many features that people liked, such as the internet connectivity, they quickly became more expensive then the Kindle, and the book store sucked.
BN promoted the Nook but the bookstore was problematic and it took forever to go international.
Amazon did not build its place in the market by attacking BN or Kobo or Sony, they built their market share by being the first mass market identifiable e-reader in the US market, a great bookstore, great customer service, and having a good product.
The first direct competition ads I have been seen have been the Fire vs iPad which is a take off on the Mac vs PC commercials. So it is tablet vs tablet not e-reader vs e-reader.
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