The volume of the commentating seems to fluctuate, at one point in turned it up next minute my neighbors are listening to Sean Maloney scream out of my speakers. All these things add to the production costs and overheads, which is obviously the reason why, if ratings remain solid then it may help justify it for the the future though.
They are definitely not very good at increasing their excitement levels without also increasing their volume dramatically.
My wife complains about it frequently!
One element of it is definitely on the production side but part of it is experience as a commentator.