I think people are likely to post announcements or spammy posts based on what they see as "acceptable" examples. If Lee craftily includes the name of his program in about a third of his posts, then why would a new member consider it inappropriate to post similarly? There is direct spam and there is creatively worded spam. I think creatively worded or crafted spam is probably the main issue. Dropping the name of your program into a post is pretty obvious when it happens, but when the boss does it, who's to think its off limits?

I like the idea of a "contributor announcement" forum, for someone that would have 100 posts on the board, and they would be allowed to post some kind of announcement on a monthly or bi-monthly basis. Give people a more prominent outlet to do their promotion and I would hope that the side door spam posts might be less of an issue. Let the drive by spammers use the spam and announcement forum.