I bought my iPhone because it's an iPod, a PSP, a cell phone, a camera, and a portal internet device all in one.
I may be stretching it with the PSP thing, but there are a ton of games for the iPhone. That was probably the biggest selling feature.
It was a big cost, I bought the first one when it was like $400.
But it's been 2 years and I'm still using it.
I may buy the new one so I can have 3G and better GPS features.
If not, I'll still get the 3.0 upgrade for free.
I didn't buy it to be an accessory, or because it's trendy.
Granted it's cool to have a nerd device, but it's also great for what it does.