The problem with the GS is not that you can't enter a dungeon if you're below the required minimum, as that's a good idea, but that we'll have a plague of players asking unrealistic GS numbers and creating a bad mood/environment within the community. If you ask me, the GS number should be private. If someone is curious enough to double check it they can always inspect your gear, as just checking a GS number is not enough, as many of you know (they could manipulate the system).
So, to make it short, why give more tools to the jerks to jerk around easier? It's too bad already with what we have (see current dungeon discussions).