Bezos is a very, very smart guy. He's the closest thing we have to Steve Jobs right now.
(Though that's not really a fair comparison -- Jobs excelled at product and branding. Bezos isn't as good in those areas, but he has a solid background in finance and tech, and he's far better at strategy.
Jobs was a samurai warrior that was so good at swordfighting he didn't need much guile. Bezos is a ninja; not as tough in a straight fight, but he never lets it get to a straight fight.)
E-books are a massive growth industry right now. In a growth industry, it's generally strategic to invest heavily in growth at the expense of profit. If you want to have a nice profitable business, within a few years your business will be undermined by the "foolish" guys that burned cash to gain market share. Walmart followed a similar strategy.
(Lesson: if you want a nice profitable business, don't enter a new, high-growth market).
First the publishers ignored e-books, then laughed at them and hated them. Now they're fighting, and some time in the next two years, Bezos will likely win. When you look at the Kindle strategy, you're looking at a business unit mobilised for war. An army doesn't return a profit until after the land is conquered.
I read Bezos' biography recently. From that, and from other comments about the guy, I think the guy is thinking long-term. Not just "a roadmap for the next 5 years and vaguer plans for the next 10 or 15" as another commenter said.
I'd guess he has concrete plans out to at least 2030 (though obviously with room for various contingencies and black swan events). His current areas of focus like retail and cloud computing are likely just preliminaries. As one internet commenter put it:
"I wouldn't be surprised if Jeff's secret goal is to achieve Singularity in space by 2030. That isn't my guess, but that's the scope you should be considering."
Sources:
http://www.forbes.com/sites/venkateshrao/2011/12/14/the-amaz...
http://www.antipope.org/charlie/blog-static/2012/04/understa...