Remember when people used to have libraries in their homes? Do you think that they actually READ *ALL* those books? I don't believe they did. But I believe the point of having a library, is that when the fancy strikes you to read a certain book, you don't have to go looking for it. All you have to do is pull it off the shelf.
I look at my CD collection the same way. To be honest, I own so many freakin CD's that there are some that I have never even gotten around to listening to. But if I ever have a wild hair and just get curious as to what Robin Zander's solo album sounded like...I don't have to do a search. It's right there on the shelf any time I get the fancy. (I haven't yet...but I'm sure I will someday)
(and don't get stuck on Robin Zander people....it's a red herring...it doesn't really matter what CD it is)