I'm another one in the don't lend gear camp. It gets used for jams, but again, I regulate the volume and control of the amp. Before now I've completely taped over the controls! If I'm in a situation where a band does want to use it (which I have been before), if they ask, fine, but I want a £50 deposit. If everything's fine after, they get it back and no harm done. If not, well they can go figure. It's amazing how quick their own gear can turn up! It may make me look like a bell end, but I certainly can't afford to replace anything.
I had someone assume the other day that I was going to lend him my G&L at the next jam, cheeky sod! Can't be arsed taking his Stingray with him (he never does take his own bass to jams from what I've heard), with the Warwick I wasn't too fussed, with the L2.5k though... nope. Not a chance.