There is a difference between a convention, which is usually a multi-day event for fans of something, and a show, which is usually a one-day event for collectors of something. I do pretty well selling at conventions, for a couple of reasons, I think. First, fans are more likely than collectors to buy things that are more homages to a particular theme than collector's items. Second, the multi-day factor allows people to visit an item several times over a couple of days, getting attached to it, and then they all buy on the morning of the last day.
The comic book show was okay, however, because the table price was pretty cheap, and for a cheap price, marketing is a worthy goal. I gave out a lot of business cards to people who liked my stuff--Mike said he'd put a couple by the time clock at his Wal-mart--and pointed people to my Web shop and blog. It's very fun, too, to have the geeky conversations you can only have at a place like this. I'm a big nerd, but I'm not out-nerding anyone at a comic book show.
I'm in the process now of putting my fan-geek quilts up on etsy. Here's my first one:
The rest will hopefully be up in the next couple of days.