Sure, and my position remains the same: I can't trust a metric I can't inspect, so while I know you have the best of intentions you become the point of trust for your algorithm instead of the algorithm standing objectively on it's own.
A compromise could be to allow someone you trust to inspect it, someone with some credibility publicly, and they can state their findings without revealing the algorithm. If you had a few of those from people I knew to be competent and honest it would significantly raise my trust in it.
Just something to think about in the interest of claiming these metrics have any meaning.
RE: Visualising Spam Scores