I note that once a member votes a ranking, 1-5, of a fellow member, that vote can later be changed. Why is it not possible to change that vote to zero? Why is it that the vote must always remain at least "+1"?

Further, assuming, logically, that any vote is registered as "positive", why is it not possible to vote negative? It seems that having a scale of -5 to +5 stars would provide a more obvious reflection of the poster's credibility as perceived by fellow members. And it seems this would be a far more fair approach when a new member arrives and begins with zero stars, or when a member seldom posts.

For your consideration....

SGE