Apple publicly said they aren't going to release sales numbers going forward (take a guess why). To retain revenue they just need to get more out of each sale -

Apple publicly said they aren't going to release sales numbers going forward (take a guess why). To retain revenue they just need to get more out of each sale - and that's ensuring somebody who comes in for an upgrade pays more than last time, sticks a few more accessories in the pack, and clicks to bump up the iCloud size (or maybe you think they've decided they've got enough, screw the shareholders and are about to start 'giving back' to their users)