The flip side is they also have to give money back if they don't listen or misbehave. We call them "fines". If they intentionally wrong a brother, they have to give money to that brother. For instance, the other day Isaac was screeching like crazy, totally wearing on my last nerve. I "fined" him a nickel but also gave him a chance to earn it back by not being loud the rest of the day. It worked. The other day the boys thought it was funny to make our fan make weird noises. I told them if they broke the fan their money would go to replace it. Nobody has touched the fan since. Usually, just a warning of a "fine" works.
Today we heard the ice cream truck coming. They said they would rather save their money.
If your child(ren) are old enough to understand money, I totally recommend using it.