At my first few Sidmouths I bought a full ticket so had the chance to dip in to anything.
I don't care for sitting in concerts (and don't like the sweaty Ham marquee) but what I won't do is queue. Queue for half an hour not knowing if I'm going to get in. This is not a complaint. I tried it and decided I don't do it. I'd rather walk on to something I can go straight in to. I always put money in the tins. There are lots of folks who do appreciate the events I pass by.
But singing against a rock band is a dead loss.