Does your church has a system of rotation between the musicians (organists, keyboardists, ensemble members and singers)?
Sounds like in this situation all the musicians combined give an amazing value to the church.
However, it also sounds like the church isn't willing to invest in their musicians for their service to grow.
It's a one way street. One side is always giving and another - taking.
This is the case with some of the churches in my town too.
They have rotation between the ensembles, no one is paid, no big deal - one person has to show up about once a month.
What will happen though, when the enthusiasm of the musicians dry up and some of them decide to stop coming to this church?
Nothing. There isn't a shortage of anonymous musicians willing to do it for fun. Sadly, they are interchangeable cogs in a big machine.
However, there is always a shortage of people who are willing to put themselves on the line, take a risk and become vulnerable to failure.
Generous churches always invest in those kinds of interactions. Generous musicians also.
It helps them to become one of a kind.