I do the same. The Mark VI I've had forever started staying home a lot more after I had a guy walk up to me at a resataurant gig and ask me the serial number. Civilians know too much now.This is why I have a "gig horn." Actually I really love my gig horn and would be heartbroken if someone stole it, but I feel much more comfortable knowing I have about $1K invested in the object perched precariously on my sax stand as opposed to $7K.
I know many others prefer to play more expensive horns when they perform, but this is what works for me and allows me to relax and enjoy myself.
Bar gigs, that's why they make Japanese saxes.