Nobody ever seems to call BMW or Lexus drivers "fanboys", and yet the same rationale could be applied to the use of that dismissive word to them ("my Kia does exactly the same as your Jaguar, and it only costs a quarter of the price").
Uncritical faddishness isn't the sole reason why people spend more on some products, although prestige is more important to some than to others, in some instances.
Nonetheless, I'll be sticking to my iPhone 5, because it's still as good as new, and likely to keep going for a long time yet, so I have no reason to even contemplate another. I still wear Fletcher Jones shirts and trousers, by the way (only Australian readers will get that reference – the rest can check Wikipedia).