A bit like buying a football shirt with a player's name on it. I see blokes wearing them and snigger to myself 'blimey, Lionel Messi's let himself go, and I didn't expect to see him in Aldi'.
If you're in communication with them about a rebooking I'd take the opportunity to tell them exactly why you won't be coming back. Venues need to offer much better support to entertainers than you received.
They do tend to be in the 'look at me, aren't I fabulous' category. Bass players in that category tend to be the worst of the lot but are thankfully few and far between.
Vitoos ISO 8 is a cracking little unit. Been using one for a few years now and no problems. Fits really well under a pedal board too being as it's so slim. As you say, shame they're no longer made,