I beg you, please make a super-bad-ass-man mode for those that fancy an extra challenge.
You can chose to become a super-bad-ass player at any moment, but you may never return to being an average Joe.
Basically, if killed by another player, they may chose to kill you permanently.
So, why would anyone be crazy enough to opt for this?
How about bragging rights in the form of a title? Maybe the ability to unite guilds and claim the throne? A fancy cape? You tell me!
Personally, I'd prefer something which offers no combat advantage.