RE: Why a limited revolver selection?
No, I think it's more from the standpoint that it's harder to shoot a wheelgun accurately because A: you don't have to expend extra energy rotating a cylinder AND cocking a hammer with an auto, and B: the bore is closer to the hand in an auto, which promotes better balance of the weapon.
Now that being said, you're gonna have to put up a fight to get me away from any of my wheelguns...