You smokin' something good? There's no way you could argue that Apple wouldn't want more market share for the iPhone, it's a money making machine. If they could put it on all the carriers you'd bet your ass they would. It would make them BILLIONS of dollars.
The reason they don't care about market share in the PC arena is simply because the possibility of making tons and tons more money simply doesn't exist. Smartphones sell at a much higher rate and there is a much bigger market for them. It's infinitely easier for them to sell a $200 iPhone than a $2500 computer.
I bet you $10 if the iPhone comes to VZW, it will not have any of their apps preinstalled or a VZW logo on the phone.