As much as I hate to give up on things, I have shut down my Artfire shop. I tried for 3 months, and got plenty of views (2300+), but no sales. I did an experiment that sealed Artfire's fate in my eyes. I did a huge push on it and did a lot of back linking for several days. I got significant traffic from Stumbleupon. Great! Except I noticed when I DIDN'T spend 2 hours a day (or more) promoting and back linking, I got very few incoming URL's. The next thing that sealed their fate was not seeing my listings in Google searches as I had previously. This was apparently due to a Google update.
I actually LOVED Artfire's interface and seller's tools. Etsy could learn a thing or two from these guys. It's hard to drop something you've stuck so much time into, but the monthly cost and work to keep it going made me feel as though I was just spinning my wheels and not actually going anywhere. So, I'm dedicating my time to the shops that actually make sales for me: Etsy, Yardsellr and Listia.
Goodbye, Artfire. It wasn't you, it was me ;)