Isn't part of the reason people are spending on iPhone that they can signal wealth to friends? From what I remember Apple always sells more when then introduce new golden colors so people can show they have the new device.
I have never seen a gold iPhone in real life, even though more than half of my friends/family have iPhones. IIRC they did better overseas(?). Not sure.
I don't think iPhones signal much (in the US at least) -- they have like 50% market share here.