[racbart]

At today's Apple, both software and hardware are means to sell 3rd party software. They earn so much on their ecosystem that it's more profitable to give OS updates for free and provide more unified and less fragmented ecosystem to both users and 3rd party developers.

Lowering prices for next generations of their hardware is also a sign that they really want to put their foot in as many users' doors as possible. I think they rarely lowered hardware prices just couple years ago, before they had this massive revenue stream called App Store.