If 10 shootes show up between 7-8am the match can be set up very easily and no one has to do an immense amount of work. The guys like Max who organize the match don't have to put in two days to host the match. I think there are plenty of people who would not mind showing up and chipping in a little work without shooting for free.
I would never expect to shoot for free at any match set up or not. If most club matches are 20 bucks shooting for 15 for setup would be a good deal. I know I got a discount at ACC and felt bad and offered to pay full price for not tearing down.
Some people won't help but others will and it will usually be the same guys and gals.