As a matter of fact, I rather enjoyed RoA set-up while I was in rez. It was mostly a fun time. A lot more laid back. Working outdoors, and generally a fun crew to mess around with. Everyone was more relaxed, but more focused. Yes, it was hard work at time, but at mid-afternoon (or whatever) break, there was lots of fresh fruit and water to re-hydrate. Evenings were often a lot of ground work, but that was better than the interminable classes and re-runs of How to Floss One's Teeth, or Song Leading. Got to pay (ie work) with people who might otherwise have been stuck in offices and who otherwise I might not have met.
We scrubbed all the portable chairs and then they were all strung in the Big Top. Scrubbing the chairs seemed sensible; sometimes they weren't very clean. They looked neat when set out - but of course they never stayed in neat lines. Scrubbed portaloos. Set out tables, cloths, the chicken frying thing (wonder if they still have that?) Planted flowers early, so that the flower beds would be lovely when people came.
I think if all that work had been going n (by contractors) I'd've been ticked off that I couldn't have been involved.
I seem to recall that as the Rock neared, we worked whole days (ie, lost Study Hall for half a day) and I did resent that. But it was fun, preparing everything to bless the visitors.
Is volunteer labour a bad thing? I don't think so. I think of the hugely popular festival that takes place at Glastonbury most years. A lot of people like to vol for that, as litter-pickers, set-up before and after, etc. They do it because they get a free ticket to the event. I vol'd at the Christian tent at Glasto (free ticket, yay!) (Springsteen the headline act! yay!!). Clearer-uppers in the weeks afterwards get paid minimum wage with few perks, but there's still plenty that want to do that.
Perhaps that's the case with most festivals, commercial or free.