I am a collector, as well as a player, but I totally understand what you are saying Nigel, and agree.
Ive gigged the now sold Sue Ryder P bass at large, very well PA'd and professional charity gigs. It sounded, well, great!
I think I just like owning them, but Ive started to come out of this rut of selling...and I do buy but that will end soon as I want a nice Audi A4 and I want to take up golf more seriously. Less time to mess about, more time to enjoy.
I do enjoy being a bass nerd though, just like my friends do with cars (and ultimately they spend/lose a LOT more).