First, Amazon is 3x the size of any of the tech companies it is compared to. Google actually hires more MBA's per capita and Amazon hires about as many as Apple and Microsoft, per capita.
Second, I keep a close eye on these things, and 72% of my class went to finance or consulting. Consulting is still the biggest draw and has been since the financial crisis.
Third, this is good news for tech. See the HBS Indicator for more on why: http://www.investopedia.com/terms/h/harvardmba_indicator.asp I'm not going to defend or bash the MBA degree. It doesn't say much about you except that you are a competent professional that likes money and can play the game. Those traits are often enough to make an employee worth their salary, but many MBAs have additional skills, analytical or otherwise. Sometimes it means you hire somebody a little too slick. This is probably why tech has such a phobia of the MBA. Fair, but overgeneralizing, in my opinion.
Finally, I think the reason you see more MBAs in tech these days isn't necessarily Bezos' finance background or the need for analytics, but that tech companies are maturing and they need middle managers. MBAs tend to be predictable worker bees that do a great job at filling out the ranks of a large bureaucracy. Most business is really about project planning, reporting, managing expectations, coordinating teams and delivering on time. It's not terribly rewarding or creative work, but it's what MBAs can reliably produce.
*edited typo in last paragraph