Bezos must be very depressed.  Is that what gave him the idea to make this move? 

Maybe. 

He's been declared now to be the richest man in the world.  What else has he got left to "work" for, or aim for?  When you've achieved (over-achieved, actually) your goal in life, then what??  If I were him I'd be depressed, that's for sure. Somehow I don't think making more money will make him happy.  I mean, really??  He could continue to buy up stuff, but what happens when he owns everything and everyone?  Will that make him happy, do you think?    I doubt it.  People need something to strive for, and he's done that, so now what will he have to strive for?

I don't think I'd be very happy in his position.  People always think they know what they want, but sometimes when they get it, they don't want it. 

http://www.naturalnews.com/2017-08-03-jeff-bezos-wants-to-be-your-medication-dealer-amazon-goes-all-in-with-big-pharma-to-take-over-the-drug-retail-industry.html