2. The rewards you are referring to (email, HN, MMORPG) have to do with dopaminergic pathways, dopamine release, and the nucleus accumbens.
On Cheney: I think it's possible to say when someone's having a sybaritic lifestyle and when they're not; certainly someone who's as eagerly discussed by the media as Cheney now is (while Clinton's allowed to live his rather un-Presidential post-Presidential years in media silence).
This isn't a defense of Cheney, though. I would call him less nightmarish if he had the excuse of wanting money as a means to an end, rather than an end in itself. It seems to be a common vice, this thinking of life as Donkey Kong, and if you die with a high enough score you get to leave your initials on the machine at the end...