BotConers: Do you keep your badges?

This will be my third BotCon, and in previous years I've noticed some folks walking around on Thursday wearing the previous year's badge or even all their previous badges. I do save my badges, they hang from my rearview mirror, and I brought my first one along for the second convention. I dunno, it seemed fitting that it should make the trip. How about ya'll? Who saves their badges? Who wears them again?