I would also like to point out that mana pots are essentially free on Lammania - we don't have a pot-chugging total for those epic and elite completions, but from what little I've seen, but raids can be won just by protecting the healers and having the healers chug pots until everything is dead. That isn't a successful long-term strategy for live.
How would you change the raids so that they couldn't be beaten on the first day and yet still be beaten at all. The pre-raid stuff does not give next-tier gear and the raids don't require it. If you have a dedicated group of end-game players, they're going to beat the raid. You could throw in ultra-complex boss-battles with convoluted dealing strategies (EQ, WoW etc.), but that isn't DDO.