A quick search on TheFreeDictionary.com lists all these as acronyms of "HBO":
HBO Home Box Office (premium movie channel on USA cable systems)
HBO halo.bungie.org
HBO Hamilton Basketball Association (Recreation League in Canadian City)
HBO Handled By Officer (police communications)
HBO Help A Brother Out
HBO High Band Operator
HBO Hoger Beroeps Onderwijs
HBO Honey Bunches of Oats (cereal)
HBO Horrible Body Odor
HBO Humboldt, Nebraska (airport code)
HBO Hyperbaric Oxygen
HBO Hyperbaric Oxygenation
Personally, I've never seen domains with letters separated by hyphens sell for more than reg fee. That may be different with acronyms, but it's still doubtful.