Yeah, I only went the first year. I enjoyed a few of the events (Anamanaguchi and somewhat drunk Scott Kurtz being the most memorable), but as there wasn't enough capacity for most of the events I wanted to go to, most of the time I ended up just wandering around, looking at things. I do that already on the internet, and I don't have to compete with a crowd to do it.
I wouldn't be opposed to going again, but the timing has never been good, nor have my finances. Plus I'd get the rest of those StreetPass puzzle tiles I'm missing.