The love of the game and its rich history. I have been collecting on and off my whole life. Obviously, when I was a kid. Again in my late teens/early 20's. And now since 2004/2005 when I was in my mid-30's. I have taken breaks here and there, but I keep coming back. I have been collecting vintage for the last 5 or 6 years and it's like owning a piece of history. I love the game. I even play in a 35+ men's wood bat league and it's a blast. My 15 year-old daughter loves it too and I'm glad I can leave her something from a bond we shared after I'm gone in another 60 years.
