True. Though, I guess that if you got a parcel, with a prim allotment (tied to land), maybe the increase was automatic. But for places where the prim allotment goes through the sim owners (like with most skybox rentals), it is not likely to be automatic.
In which case I still think it might be smart to ask for it. If a lot of such renters ask, at the same time, it might impact the decision made.