I only use them at conventions. And only at cons where I'm not widely known (which are few and far between.) Like ACEN, where staffers in my same department don't even know me. Or when I feel like displaying all the adult themed badges I got from Bob Dejesus. A good number of cons I goto however I don't even bother carrying my badge around with me since I don't need it to get in anywhere usually.
Generally though, they just take up space and collect dust.












