The best reason for this level of service is: You get to stop caring. It's fast enough that everyone you invite over can do _everything_ on hardline and they won't impact each other.

As others have mentioned you could also actually run (personal) servers at home as well.

* Games, with higher bandwidth (audio, video conferencing)

* Live auto-video conferencing the easy P2P way.

* Have a media library of your own and access it while out. This can include private video memories, not just photos. However you could also store and forward images of legitimately purchased HD content* (Assuming you support the private use format shifting doctrines).

* If you're teaching a class from home that video-call could be self hosted, rather than routed through a data center half a country away.