A small suggestion, give the ones who scream for challenge some lairs, you know, some massive dragons in a room and some goals, like something you might find in Neverwinter Nights. Then allow up to 12 people to play in these lairs against a monster.. Make it incredibly tough to beat..

I suspect that the reason for the 6 player limit is that you use the lead team members client to keep track of the other five players game, to offload the burden from the main world server. If you need to talk about some ways to compress the packets to cram more people into a room, open the discussion, I'm sure there are a few programmers playing this game that could offer some low-level coding suggestions for the games to make such scenerios of game play possible.

Its not about that the programmers in the DR team cant do it, its because people dont want it. If you search the word raid, dragon or "more party space" you'll find enough to make a conclusion.
There arent dragons in this game, and as far as I know the maxof a party is 5, not 6.

Well the Queen of Shadows is kind of a dragon. Maybe not in the typical sense but very close.

Shadow queen a dragon? Its a queen, dont say Dragon to a queen :P And no, its an angel... form mutant thing. More angel then draggon if you ask me. But full dragons, like in cartoons ect. arent located in this dungeons.