This is what gets me (and perhaps I made my own thread on this issue too quickly ). There is no precedent at all for that level of organized or incentivized pvp in the Diablo series. Putting in those things just sounds like square peg into round hole of the n'th degree. Not only is it unequivocally a balancing nightmare to openly support that level of pvp (just take a gander at, if not WoW, any mmorpg or rpg game out there that promotes itself as having a serious pvp aspect), but it's not at all part of the genre.
PvP in oldschool diablo was a little amusing past-time that some people ply'd at more than others. Duel games were for having a little fun, talking smack, maybe wagering some gold (or stealing piles of it), but never to establish one's self as being a pre-eminent pvp player. People with that mindset hated the diablo series (at least the ones I knew) and had a lot more fun with other titles.
I would definitely not say "keep pvp out of the game," but diablo's very minimally developed pvp was part of the experience. You didn't come for the pvp, but if you did enjoy it, you had another little thing to toy with between mf runs, leveling, or other pvm activities.