Perhaps 100% of the board was in favor of the proposals. That's well above any margin of error.
In most representative forms of government we elect people to use their experience, knowledge, and judgement in our collective best interest. They are not obligated to decide whichever way the majority wants. It's not a democracy, it's a representative form of government. We elect them to use their best judgement on our behalf, and if we don't like the decisions they make it's our responsibility to vote them out of office when their term ends.
NSRCA members vote by not voting too. If a majority don't respond to a survey, it doesn't invalidate the survey. Same as any election where people don't vote.
Also, we are talking about AMA rules, not NSRCA rules. Any AMA member can and should have a voice in making decisions that affect the AMA rules.