I think we may find "hero_c" to also be "bay_a's twin" or "cubical partner". I have found that if we just hit the "report this message" link at the bottom of the posts in question, the folks in Australia at forkliftaction.com will 'fix' the posts and posters in question. there is plenty of moderation in these forums, it's just that not all the folks with moderation privileges are in the same time and holiday zones as others of us reading here.
If anyone has ever tried running their own on-line forum, you would know how difficult it is to stop the UCP (unsolicited commercial postings) while not blocking entire countries or continents.
At least here, it is slowed down to a point that it requires real people and real people's time rather than an "bot".