NOPE. A working band is not an exercise in socialism, it's a business and should be managed as such. I bring thousands of dollars worth of gear to the gig, and play instruments that I have spent months customizing. I practice for hours so I can confidently play every song in the set and justify my cut of the pay. On top of that, I help lug EVERYONE'S equipment in and out of the venue (not just my heavy-a** stuff) and set up sound and lighting as well. We all pitch in. If all someone did was waltz in and plug in a microphone, why they would have some "larnin" meted out by the other guys. When your backup singer expends the same amount as the rest of the band in equipment and effort, and takes a more invested role, then she gets full band-member pay. Right now, she is earning back-up vocalist pay; and IMHO you are paying her too much already.