The point is to make a balanced dueling environment in which a skilled duelist can compete with any character.
With the exception of druids, they've pretty much achieved a balanced state of dueling with those rules.

If you saw the skill level of the sorcs that duel there, no melee could beat them in hell. They need to duel in nightmare.

If you saw the skill level of the zons, if they had pierce they would kill everything.

Public duelers are easy kills for them, they don't need the hacks/dupes/bugs to win, they win every time.

/w *thesuck for duels.
I use only legit but will be happy to take anyone on 1v1 in a friendly duel =)