Love11- I went to my first fest two months ago. There was only one person there who I'd actually met in person before (but we hadn't seen each other for like, 12 years). I was surprised at how mellow the vibe was. Every person I met seemed pretty normal, actually. I had a laugh over how very different many folks are in "real life", as opposed to how I'd been picturing them. For the record, most of the guys on this site are a helluva lot hotter than their avatars would lead you to believe. I say this as someone who's utterly monogamous, but not dead yet.
I think that some opportunities existed for some "bad" behavior, ie drugs, drinking, hooking up, but it wasn't overt, and I had a lovely time at the party, nursing my one drink. I imagine that, like all parties, each apostafest has its own feel, dependant on who's attending. But my one experience was prolly 97% positive, for what it's worth.