Boards
Things you just can't stop buying
regardless of how many of the same thing you already own. Like me I keep buying red cardigans and tops that look the same to everyone else, but I just feel that I can never ever get enough of them.
But at least this is something I can actually use, as opposed to say, Pez dispensers (I don't know anyone who buys loads of Pez dispensers and I haven't bought one in years, but it was for some reason the first thing that popped into my mind)