It's pretty blatant people are voting "no" to make a point. Our healthcare is clearly far superior and would prove beneficial to the dominant demographic on the forum. Though I suppose it is the "Political Debate" section so I should expect people to vote politically.
I think people are voting for security, ff. Many people posting on this forum are workers, and even if they are relatively well paid workers, their access to health care under the american system would be extremely insecure and dependent on their holding a job. Aside from the tenuous nature of jobs in a general economic sense, it is worth noting that there is no reason for an employer or an insurer to retain an individual once he becomes sick.
A 'no' vote is not a political vote, or a vote to make a point, but simply a vote in rational self-interest.