I like to see the room promos in World Chat. It shows me who is dedicated to the work they're doing and show what rooms have value and effort. Especially more relevant than the rest of the nonsense in WC.
I support an opt-in broadcast channel for room promos.
Perhaps multiple global chat channels to disambiguate the Sex promos from the music promos, someday.
But I'd be satisfied with a global promo channel for everything first.