To be fair you're missing a lot of parts and the ones that they share are a lot more high end on the N1. Twice the CPU, 4x the RAM, over 2x as large a screen, GSM/EDGE/UMTS/HSDPA radios, GPS, compass, still/video camera with flash and autofocus, etc etc.
And on top of all that iSuppli's figure is just an estimate. Considering every phone in the same league as the N1 is in a similar price, there aren't obscene profits being made. If they really cost $150 to make someone somewhere would start selling them for cheaper--we're talking CE here which is defined by brutal price wars. Don't think that HTC would settle for being an OEM when they could own the market by selling devices at 1/3 the price directly.
And on top of all that iSuppli's figure is just an estimate. Considering every phone in the same league as the N1 is in a similar price, there aren't obscene profits being made. If they really cost $150 to make someone somewhere would start selling them for cheaper--we're talking CE here which is defined by brutal price wars. Don't think that HTC would settle for being an OEM when they could own the market by selling devices at 1/3 the price directly.