Many people are collectors. Some collect fine wines for their wine cellar, some collect stamps, fine cars or even Beanie Babies. Oil is a cheap way to start collecting, and you know you will have a use for it some day. You can arainge the bottles on a shelf in a way that looks cool. Take a bottle down and read the back even though you have read it many times before. (just like baseball cards when you were a kid) Stack the bottles in a row as if you owned your own oil store. Dream about which oil you will use next, and in which vehicle it will go.
Whew, geting all excited about this; I think I'll go out and buy some oil..