I guess I have been lucky. Not that I often loan out my bikes, but when I have, they always came back the way they left. The same for when I have borrowed a friends bike. Of course most of these loan outs were merely swapping bikes for 10 or 20 miles for kicks and giggles. But I also use common sense as to who I will let ride my bikes. If I know they don't have any money and would not take repsonsibility (my wife's oldest son for instance) if something bad happen, I always say NO!
Any Road Any Time!
2011 BMW R1200R - The Redhead with Big Jugs I have always wanted!
2009 Vespa GTS Super 250ie - Just for Kicks & Giggles