I've run in some full Pre-50 parties in Azure Blades, and it certainly makes hitting the Warzone Queues more fun pre-50. Not because I'm stomping anyone, but because I can run a different Class, AC, and Spec then I can in 50 PvP. My premades don't stomp people that often, because we're in the same kind of gear, and of similar level. I personally don't play with anyone that gets into full Purples, because I agree that running with a full premade in purples is unfair.
All in all, I see what you're saying, Tann, but I personally don't see the double premades in Pre-50 or see it as a huge turnoff for newer PvP'ers. I certainly don't see myself as stomping anyone as a level 30 something Sage.