May seem a little harsh but after a number of bad experiences by being too hospitable and being given back damaged goods I dont allow anyone to play through my gear. Not even support bands, it doesnt please everyone but I paid too much money for someone else to damage my baby. I dont ask to borrow gear for gigs, ive had to hire amps before now when the rig needs attention but I belive that to be in this game we need to be self sufficient. Its just professional.
Clear black and white policy. if they want to sound good enough to get paid then take responsibility for making that possible.
just my view on it.
C