"Collecting becomes hoarding when one accumulates more than one of (otherwise) "identical" items?"
Hmm, I have a drawer full of Campagnolo Gran Sport deraillers. I don't feel I'm hoarding them, but I'm certainly saving them for the right bikes to come along. In fact, I know I have at least 3 frames that they're right for. I have been selling things lately I realize I'll never get around to, so I'm purging as well.
Hoard and purge! There's a topic.
Ted