This is a fine idea. It was crowd funded so nobody came out of pocket too much. The more negative messaging out there the better. The cost is the cost. Saying it may have been better used elsewhere is pointless. Its done, and it going to be seen by 70% of the people going to the convention at least by what I can tell. Many may not have even heard of such a thing. Maybe it will shock some enough to look, or their kids will google the link int he back seat on their phones.
I do agree "kingdom hall" could be over the public s head.