Polling like that is a bit like comments on Twitter. It's covered in 140 characters. It's the way you ask the question. Most union members, in my experience, and I've dealt with them for many years.... Sure, they want to know what the union is spending. Where's the forum to get that? It's from their union.
Now, that's entirely different than saying that they want their union not only to have to file these huge forms but to answer every question that comes from every person, whether a union member, or a busybody who is fussing around on the Internet trying to figure out why union president X paid $3,672 for an arbitration. It's a huge burden. I talk to these people daily, and not just the business agents. I talk to ordinary union members, and I don't hear them saying they want that sort of thing.
I'm sorry if that disagrees with your surveys, but it's not my experience.