Lets be real! Christianity has a business aspect to it no matter how many words you can speak in your heavenly language! Payment should depend on your position! If you are the M.D. or M.o.M. doing all the behind the scenes work then yes you should be paid more NO MATTER THE INSTRUMENT! And if you are an assistant you should be paid more but not as much as the director (no matter the instrument).
Should you be paid more just because you play the keys HECK NO! That's like paying a white man more money to do the same job just because he's white!