To me, there is nothing wrong with us "musicians" saying, "No." It's not about being materialistic or anything like cause I know I wish I had a lil more money to play with, lol... It doesn't mean we're not Christ like to say no either. If you're a musician and you're going to a service where your church, your group or whomever will be singing/performing; why wouldn't you have you bass with you? I'll let you use my amp; but my ax, NO! I mean, can't we almost relate that as to going to church without your offering, your tithe, or your BIBLE?
All of use that spent good money that we worked hard for to purchase this equipment that we have; we've earned the owner's right to say who can and who can not use our gear. It's nothing hard or complex about it. If a person that ask has a problem with you not letting them; then the fall back is, "Where is your equipment?" I've had plenty of guys to say, man I wanna play your bass, cause of it's looks, and they got a bass on their shoulders. So again, even as Christians, we have the right to say no and NOT feeling condemned about it. Just my two cents and take on the matter.
Keep bassN ya'll...