I'll lend out carpentry tools and machines to friends and family. Very few of my tools are too "precious". I've got some of my hand planes and chisels tuned up for fine work - i wouldn't send those out the door for brute work, but i've got other chisels and planes that are set up for that, and i've lent them out from time to time. Every great once in a while, there will be a mishap where something comes back in worse shape than it left in, but sometimes those things happen to me using my own tools. Fortunately, i don't have any "deadbeat" family members or friends.
People have lent me many things over the years, saving me a lot of money or effort. What goes around comes around.
Paul Hubbman