Reminds me of how we used to negotiate stage setups with this one particular band when we did a shared bill. These guys were notorious for sabotaging other bands sound. They would always insist on using their FOH, but we would then insist on using our lighting. Sabotage our sound - okay, next set, try playing in the dark! Very effective leveraging technique.
"Use your ears and what is between them and you will be fine." - CL400Peavey