Sure, you may not have blamed them specifically, but you did imply they were rude and selfish. MSQ roulette is a situation where you scratch my back, and I'll scratch yours. New players, despite what you think, would be suffering from far longer queues to accomplish anything. Finding 8 people who want to spend an hour in a dungeon that is from years ago is going to be slim. So yes, the roulette gets people in quickly to complete the MSQ while the 'helpers' get some tomes or quick exp.
Also, unrelated to the current reply, but the thread in general:
Cute little sprout getting snippy.
The CM/Prae situation is not ideal, but that's why SE changed their evil ways in later dungeon.