It's pricey and often complicated to incorporate NFC at this stage. The phones that have it so far are more like experimental/reference platforms than anything else. When NFC is available on combo chips it will be everywhere, and manufacturers are just starting to commit properly now - Samsung and Acer have indicated all their future smartphones will have NFC within the last few days, BlackBerry is going the same way, and dear old Nokia could be too. Basically, it is still early days...