This tells me that people really aren't that interested in the concept.
Most tech shows do a call for papers, and require presenters to provide a synopsis of their presentation. The organizer then chooses among the most promising to speak. I am pretty sure this guy just asked a bunch of start-up guys to come speak about anything, regardless of what they were going to speak about. The content was so.... blech.
There was actually a third room with presentations for beginners...I think Antonopolous held one of those discussions, which I sadly missed.
I've not been to a tech show like you're talking about, but it did feel a little thrown together at times. I think its highly likely you got to speak if you were a financial backer for the conference, which is how a lot of trade shows work...more money = more speaking time.