Just look around your friends and relatives.
How many of them did switch form iPhone93 and 4) to one of Android phones ?
The day of making $400 from each iPhone is gone, and will not be coming back
because of the competition, serious competition from Samsung/HTC/Google/LG
and many Chinese brand smart phone, and also because the technology is
mature. Yes, iPhone is still better in some aspects, but not all. It's
certainly not worth for extra $200.
Knowledgeable people know other phones give more for the same money(such as
HTC droid DNA with 1080P) or much less price for the closed spec.
Smart phone is just a smart phone. It's not like a car or brand name bags
because its life is only a couple of years.