thats all i was thinking too. sleep problems usually dont happen if you use current and good brand hardware, but in an HTPC the one thing that is absolutely essential is reliability, and sleep problems can always pop up randomly.
it would also allow you to run services like torrents and whatnot, but honestly i have a separate server for that. that thing runs music streaming, skype in and out, torrents, and tv streaming through orb. my htpc is already running all my games i really didnt want to put all that other crap on it.
what sucks is my server is a e3200 machine... so its probably suckin 75w from the wall at all times. i turn if off a lot because of that. a zacate server would be absolutely killer.