I would speculate that it's because Nest's products aren't scalable in the way most of Apple's other products are. The appeal is too narrow, appealing primarily

I would speculate that it's because Nest's products aren't scalable in the way most of Apple's other products are. The appeal is too narrow, appealing primarily to ultra-techy folks or people building/redoing their home. Phones and mp3 players and computers are owned by almost everyone. I just don't see smoke detectors and thermostats having that same kind of broad appeal. Nest is neat. I don't have one but my neighbor does and it's a fine product. I'm as "gadgety" as the next guy here, but even after playing with Nest and being impressed I still wasn't compelled to buy one. I dunno, maybe one day.