Around here the majority of the bands are comprised of teenagers under 20, and a lot of them can't afford a decent bass/rig, let alone a car to get it there! So i don't mind letting them use my rig too much, my band's equipment tends to be used by everyone on the night, because (i don't like to be big headed or anything) we have fairly good equipment in comparison to most other people's. Sometimes other bands bring their own stuff, sometimes they ask to use mine, and that's fine. The ones that don't ask, and then act like a prick to me afterwards, they're the ones i don't like and don't get to use it again. Fortunately i've only encountered a couple, and we didn't play with them again. Nobody borrows my basses though. If they can't bring their own bass, then they're not a bassist, and if they beat the hell out of their own bass and break it on stage, they sure as hell aren't getting their hands on mine!