This one of those "If I have to explain it, then you wouldn't understand" things. I've tried to explain it but couldn't. The people that do understand don't need the explanation. For example my co-worker collects Zippo lighters. I understand why he does it, because I collect watches. To a non collector, this is all stupid stuff, and they cannot understand why we do it. I didn't understand either, until I got bitten by the bug.