How much do balancers make?

I'm curious to know, just how much do balancers in the cryptocurrency industry typically earn? Are their earnings primarily tied to the volume of transactions they facilitate, or do they also benefit from other factors such as the overall health of the market? I'm particularly interested in understanding if there's a significant difference in earnings between experienced balancers and those who are just starting out. Additionally, do balancers have any opportunities to increase their income through additional services or investments?