You are definitely not the only one, I've heard of a bunch of people that collect them. I have a friend that has a cabinet full of NIB Gems. He has upwards of 75 NIBs, including gems like, Original Inferno (USA), various quantums, Columbia Beasts, several faball hammers, Orange Dot, 2 or 3 Yellow dot bleeders, Sur D pro!, and that's just a few of them. I was in heaven when he showed them to me.
Personally I have 60+ bowling balls used and NIB.
NIBs are
Black, Pink, Burgundy Hammers
Cuda/C
Orange Pirahna
Original Inferno
Orange Dot
Crown Jewel 75
Teal Rhino Pro
and a few others I can't think of off the top of my head.
So yeah, if you want to start collecting bowling balls, I say do it. Its quite satisfying. BUT don't do it if your going to feel guilty, and make sure you have a place to store them all... I am officially out of room. hah.