Share 'Participant Fees'

I'd like to get some opinions on the following: Along with everything else I do I'm a Living History Re-enactor. Primarily a Confederate War Between the States artilleryman but my wife and I also do 19th c. civilian from a variety of periods. The thing that's happening lately at some sites in our area is that the sites want to begin charging VOLUNTEERS a fee for coming out and staging these even…