------------> Rationalization Alert!! <------------
Well for me personally I don't really need an iPhone 6+ the 5 I have now works really well, but the thing is, here in Japan, when the new ones come out the carriers really make it worth your while to upgrade, as they make money on keeping you in their system. To add to that incentive, for example, if I change from my iPhone 5 now to a 6+ 128gb phone, it is free, my monthly rate over all goes up about $5 ($2.50 for the phone and a rate increase of about $2.50), maybe less because they have introduced a new plan to make calling any other smart phone on their network free, all the time, and with unlimited data for the price, it is a good deal. Now to get the free new handset, I have to give up my old iPhone 5, or I can pay it off, I think I have 8 months left on my iPhone 5 so I might just pay it off, and keep it as a backup or to send to my kids in Canada, one of them is still using an iPhone 3GS, and we are getting into battery problems with it.
I know your systems in the US and Canada are not the same as here in Japan, but here if you wait and want to change your phone you pay more, for example anyone with a iPhone 4 or 3 they have to pay an additional $11 a month to upgrade, plus the $2.50 or so in rate increase, so$13.50 a month, for me upgrading to the 6+, from the 5 it is free for the 16gb and only $2.50 a month for the 128gb and about $2.50 for the rate increase, so lets say $5 a month, over the two years that is $120 compared to $324 for someone upgrading from an older phone. They really do try to get you go upgrade here. My iPhone 5 is working fine, but I know the battery will start to become an issue at some point, yes I can change it myself, and I've done so in the past on other iPhones, but that takes time and costs money too.
I'll see what it feels like in the hand and if there is any small print I've missed
The pessimist complains about the wind; the optimist expects it to change; the realist adjusts the sails.
William Arthur Ward