Why did you buy your phone?
You buy your phone because it is the one you want, whether the OS is iOS, Win, BBS or Android.
It really doesn't matter, you chose the phone for YOU and your requirements.
I've had all sorts, Seimens, Nokia, Phillips, Sony, Ericsson, Sony Ericsson, HTC, iPhone, Samsung, Nec, Motorola, not in any particular order dating back to my first in 1994.
The last five were a HTC Hero, Desire, Sensation, iPhone 4S and finally iPhone 5. To be honest I have not looked back. I use my phone for my business the iPhones worked without a hitch unlike the HTC's which required daily attention and tweaking.
On the strength of the iPhone I bought an iPad again for business, they both seamlessly update my files as I need them. Finally this year I ditched my crashing slow to start Dell 1645 XPS and bought a MacBook Pro with a I TB drive, not the retina one I might add. Now when I get home late at night I don't need to imput any documents or updated stats and daily calls from my ipad because it is already updated on my MacBook. My old Windows Software, accountancy stuff, games, Office etc runs on a Windows 7 partition or within OSX using Parallels.
I may well have bought into the Apple Ecosystem, but it saves me time and it works without giving me a headache. I no longer have to work into the small hours inputting data because it is done as I go along.
You may have made other choices, that's your choice, just as your preference in food, beverage and sexuality.
All of that is fine with me.