I believe Synology NAS units support most of that. The price may not be comparable to something you could build yourself, but for those that want a turnkey solution, it's a viable option.
And yes, you definitely get those extras. Mine also hosts a few virtual machines. The difference in speed and power is significant. But really, the bigger bonus to me is the stability. The RPi solution wasn’t nearly as stable. Yes, it costs more, but after all the extras like powered USB hubs, etc... it wasn’t that much more.