I don mind lending my axe to someone who needs it...but they beeter not abuse my trust.
I once had a gig at tjc and the guy in the house band broke a string on his les paul. I lent him my strat for the rehearsal but during the rehearsal he started passing my instrument around to his bandmates like as if my instrument was some sort of comodity. look, if i lend you sth it means i only trust you and NO ONE ELSE to handle it. if you wanna lend it to somebody else and it belongs to me you better jolly well ask me first. the best part was when i came back to the rehearsal, everyone from that band had already packed up and was leaving except for some fat stranger who was still playing my guitar(he probably liked my axe so much that he couldn't put it down) and the guy whom i originally entrusted my guitar with was nowhere in sight.
This is one of the reasons why i think twice before lending anyone my axe. And they have to agree to my conditions first if i do.