EAA pays $$ZERO for the Monday night concert so there is $$NOTHING to save. Ford sponsors it and they and others fully sponsor other nightly concerts and other entertainment throughout the week. Furthermore, there are sponsors for so many different events, programs, buildings, and just about anything else.
If EAA could get a sponsor to put their logo on the port-a-potties they would do it. And if they could get sponsors for every expense they actually incur themselves, don't you ever believe that the admission prices would decrease. This is the cash cow and the cow refuses to be milked dry.