While I haven't voted on your node either way, I guess the main reason is that the effort to implement a "solution" that won't work much better is too high to the perceived gain. Re^4: Could vote multiple times in voting booth (awe) shows some of the approaches that were considered.
In the end, I think you're putting too much weight in the vote on a poll here. If the poll had any meaning other than being fun or thought provoking by virtue of its question or the possible answers, then that might be different.