You seem to be saying contradictory things. You're saying it's not a good incentive, but you're also saying Apple should have added it already. Why should they have already added it if it's not a good incentive? Why should they add it now if it's not a good incentive?

My argument is that adding it makes their product better, so they should add it. And if they add something that makes their product better, that's an incentive to buy it.