This is a great subject, and one that I've seen come up frequently over on the Taylor forum (when there used to be one) on AGF. Taylor owners are, by and large, rather high on the anal scale when it comes to their axes. Many of these folks don't let others play their instruments. I can appreciate that since part of the Taylor thing is a reputation for exceptionally beautiful wood creations -- at least on their higher-end models. And, they're Taylors so, of course, actually
playing them to hear what they sound like is clearly not as important as what they look like.
[ OK, that was a little tongue-in-cheek, people. I'm not a hater...
I actually own a Taylor!
]
Seriously, though, while many Taylor owners are handling fairly new, pristine instruments, I think that's a huge contrast with the good folks here on LTG. Many/most of us here are no strangers to older, vintage axes that have weathered with time. The patina of age -- not to mention the effect of poor treatment occasionally over the many years of a vintage instrument's life -- is its own beauty, and I think we recognize that.
Along those lines, the question for us here is more like what are the odds that this person will actually damage my axe? Not so much will they put fingerprints on my finish. Some of our axes are literally unreplaceable, and that speaks to Jazzy's point that "it depends." But, for the most part, our vintage axes can be fixed and perhaps not worse for the wear.
For me, the overriding thing is to share the joy of Guild's sound/tone with anyone who's interested. At any setting where I can keep an eye on my guitar, I am willing to let someone play.
Someone else mentioned loaning/borrowing an axe. That would be a no-no for a stranger, and definitely a serious discussion with a friend/colleague before doing that.