It all depends on your personal situation. Joe can obviously afford his collection, the space to put it in and the upkeep required to maintain it. He could have spent that money on cars, a yacht, a plane, or hookers and blow, but he didn't. That was up to him. If you don't have enough money to pay your rent, another guitar is probably not a wise purchase. If you have so many guitars that you can't find some of them, you probably have too many. If your house is so crammed with gear that you don't play some of it because you don't want to have to move a bunch of crap to get at it, you probably don't need more. AFAIK none of this applies to JB, so good on him. I'm not a fan, but if I had his kind of resources I'd probably do something similar.