Well one might hope that the incentive for providing iPhone style support would be iPhone style customer satisfaction. The situation you describe is basically

Well one might hope that the incentive for providing iPhone style support would be iPhone style customer satisfaction. The situation you describe is basically that the OEMs didn't get a good deal from their OS provider and are choosing to pass the costs on to their customers in terms of poorer after sales service instead of higher up-front costs. As for Apple, they clearly don't do anything out of altruism, but they seem to try to have deliberately structured to maximize customer satisfaction over time so as to justify higher margins.