Me either- unless they want me to be the plate umpire!
Seriously, I hate that practice. Both umpires have the same expense in getting to the field, equipment (okay, so the base umpire just doesn't happen to be wearing his at the moment), training, registration, etc.
Both have equal- if not identical- responsibilities during the game and an equal expectation that their duties are carried out correctly. And, depending on how the game plays out, the base umpire will be hustling and running and exerting just as much effort as the plate man- if not more.
No leagues I'm aware of in my area have this "split" pay scale- and I'm happy with that!