Not sure what you are trying to determine from this poll, but it will likely give you a false impression. Folks who have pico or smaller tanks are going to vote expensive salt - little impact for them to use latest fancy salts. Folks who have monster tanks use what is cheapest because you can have success with any salt out there. So your poll is influenced highly by tank size (most are probably on smaller size!) and overall cost (because even folks with pico tanks know they can grow most sensitive coral with any salt).
So in my opinion it will not produce any data you can really rely on.