It must be really disheartening to spend so much time and effort -- I look at the "new member" list regularly, and it is obvious when they are spammers. It is a crying shame
A word of caution -- avoid any links in posts or new members until you see they can be trusted -- usually after some real posts and replies show they are okay.
For those who don't realize the extent of the problem, it's because you can only see the end result after they are banned and the offensive posts have been deleted.
So, thanks, Mel, for what you are doing. I still believe this site is a positive haven for all kinds of arts-related interests.