I went to the Expo last November - had a great time, accomplished nothing as far as selling a script, but really polished my pitching technique and built up my frayed nerves. (I also did Take a Meeting, here in NYC)
As to cost, I spent almost $600 on travel expenses and $120+ on the event itself - came in Thursday night, which accomplished nothing really. Best to get there for Friday night mixer, pitch all day Saturday and Sunday, and go home. Spend the hotel night money on more pitches. (And a CAR.)
Oh, and mixing Saturday too.
Hollywood after dark anyone?
And I assume FadeIn is more of the same.