Even that difference is not big enough to offset the total profit in this one year, it generates larger benefit to Apple by making sure enough people to stay familiar with iPhone's user interface, not the Android's.
To help you understand how important that factor is, I can tell you that I've heard 4 times from 4 different friends of mine that, after long time consideration and trying different computers in the stores, they chose Windows computers over Macs, not for price reasons, as their employers were paying. They liked the hardware design of Macs a lot more, but it is much more comfortable for them to use the Windows user interface, even though they all heard a lot about the easy-to-use and less-prone-to-virus attributes of Mac OS. That's how strong habits can affect the sales in the long run!