"If they are on our list and are not making at least one post a week about precious metals, then they need to be removed."
If you do that then I am out. I am lucky to write 1 post a week anyway. While I have a sincere interest in precious metals I don't write a lot about them on steemit except in comments (I am basing my content here on crypto primarily). I think as soon as you start excluding people and setting boundaries to keep people out you are closing it off to new people and it will fail.
There needs to be policy to stop the bot being exploited by abusers, but otherwise keep it open to people who are interested in PMs.
Good point, and I know there are some memebers like that, but I don't see you abusing the bot. Once the word gets out that we have a bit with a good upvote strength then a lot more will try and join, and then the real abuse starts.