Well, yeah... in Walter's case it's Guitar Acquisition Syndrome, and he's got a bunch of them. He used to have a lot of them in his Maui studio, all strewn about, and lots of basses (slabs) too. He may have fewer since his divorce...
Here at TBDB, it's Gear Acquistion Syndrome... could be double basses, amps, bows, recording gear, or my own personal Achilles' Heel, strings.