I would like to see a Hall of Adept and Masters

[DPZ2]

You can if you've taught the players the proper way to play then you can raise the bar for clearing content. Making the way for harder and harder content as players level up. Players then have the choice to stop playing or play the the standard.

Developer conundrum: how to best satisfy the small core of "make it so hard that unskilled players quit" without actually changing the game so completely that unskilled players quit.

Business conundrum: more players in an MMORPG equals more revenue. Deliberately creating leveling content that encourages players to stop playing equals less revenue. Which, as the owner of the business, do you pick?