>>Basically they are being squeezed <<

Is that you or the lemons, Sal :-) or both maybe :-)

Seriously, you make good points. I think traders at festivals should be by invite to suit what the festival requires. They should be charged a fair nominal stall fee or preferably charged nothing, since after all, they are working and providing a service to the general public. If they want to go to any of the concerts, then they pay like anybody else.
I think everybody likes to see a great variety of good quality of stalls and as many as possible. We all like having a good old browse.