Ask HN: Why does Apple have so many OID's?

On my home network I see: 78:CA:39 - Time Capsule 00:25:4B - ~5 year old iPod Touch 2C:F0:EE - MacbookAir DC:9B:9C - iPhone 5S C0:F2:FB - iPad (whatever the first one with Lightning is) 34:C0:59 - iPad Mini (current) 00:17:F2 - Apple TV D8:CF:9C - iPhone 5S 00:16:CB - Oldish MacMini D4:9A:20 - Oldish iMac 00:11:24 - Airport Express I'm missing a couple of devices, but no 2 of these share the same OID, even devices in the same general class or purchased in roughly the same time frame. Just curious if anyone has info or thoughts on this?