The iPhone is over 3 times more expensive than the iPod touch, how much more margin is Apple doing on the iPhone?
The premise that components are the primary cost to bring a product to market doesn't hold much water for any iOS device.

The most astute quip I have seen was by Horace Dediu on twitter as @asymco:

The iPhone is a salesman hired by the operator to sell mobile broadband service.
He gets a healthy commission because he's very good at it.


I wouldn't confuse the initial price point or ongoing price point with the incremental cost to manufacture and sell a mass market product several years after release. The iPhone 3GS is still for sale and clearly it doesn't cost as much to make now as it did on the day it was released. It's also clear that each device released at the $650 retail price point doesn't really cost that to make. Retail pricing is more of a calculated gamble that the market will bear that price. Only months to years later can the margins be measured.

I think the cart is a bit before the horse as I read your question. Also, I wouldn't say the difference between 3GS to 4 to 4S rear camera is small. The iPod touch rear camera is measurably worse than all of the above so I'm not sure how to address that other than offereing a different opinion.