We don't sim any of the raids. If someone wants max rewards, they are there for the taking. If just one member wants to run the raid, having them on sim keeps them from playing that part of the game. We still have people that enjoy the raids even though 99% of the guild can easily solo all of them. Everyone else plays the 0 damage lotto and doesn't have to lift a finger. It works out fine. We are a casual guild and not everyone has the same level of ambition - those that want it badly should have a shot at it. Those that don't care about the rewards... Still get paid. Works out fine.
The day any of those raids goes more than an hour from launch to completion is the day we'll start talking about putting them on sim.
That being said - having the option to sim is something that I value as a guild leader - if that's what my guild mates want to do, that's what we'll do.