Really they do? A new processor when the iphone 5 is already fast enough. A new camera when the camera is one of the best if not the best. Why do you need that if you have the 5?
Better/higher res pics (for printing), better gaming (textures, rendering) or app (more threads) performance from taking advantage of the new chips.
Also refined hardware (antennagate, scratched chamfered edges etc)
Then there are those who just want the latest and greatest in tech however small the change is. Also helps that iPhones have a decent resale value to enable this constant upgrading.
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