Back when I used to do 'walk-ins', I take the bigredbass and I'd let anybody play it that was reasonable, not hard in Nashville, lots of great players who realize what they're holding; you very well may be playing next to a guy with a primo vintage guitar that's even more expensive.
On the other hand, bars are @#$%holes regardless, and I have said NO quite easily on a few occasions as required. Said hapless churls, I wouldn't have even let them play a Squire !
J o e y