Wish I could help ya with this one, but I'm in the same boat. I already run air pressure between 25-27#. I read that the weight saving of not having a tube is one reason to go tubeless, but in my mind, the sealant has got to cancel out much of that... maybe I'm wrong.
The one obvious reason would be to eliminate flats. Knocking on a really big piece of wood, I haven't had too many problems in that area so I don' know.