Your band actually plays for free.  They live for the

four hours they are on stage.   You are paying for the drive to your

venue, the time it takes to set up equipment and have a sound check. 

 The four hours they are on stage is FREE.  After your four hours they

tear down, pack it up.   They drive home and the unload when they

arrive home!  Being on stage entertaining your guest is fun for

musicians.  Keeping your guest entertained and on the dance floor

makes it the all worthwhile!