I guess its just 'human' to suffer from this affliction, because it happens to folks with other interests as well (gun's, cars, antiques, silver, china, etc.). Somehow, thats comforting to me.

The part I'm struggling with as I think about N+1 is why do some of us tend to forget that the formula could be N-1+1? I have bikes with whiskers that I haven't ridden in years, but I still have an attachment to them. I should sell 'em or donate them to a charity or something. I could just say "If I'm going to buy one, I'm going to dispose of one (or two)".

Does anyone follow the modified principle N-1+1 or some other variant?