Nevertheless, by the end, I found I’d sold all the Loonie Dreadfuls

True story - I didn't go to the Expo (fuck Hobby Star right in their ass, that's what I say, and will until I have something I need to promote there), but two of my roommates did, and in between Carrie Fisher stories they mentioned "yeah, one of the horror authors was just doing this brilliant thing where they sold you a pamphlet thing for a buck, as a sampler."

I dunno if either of them bought it, but they were really impressed with the sales gimmick. I think it's a winner and you should keep doing it at future cons.