No one like the forum police, but they do a job. As good a job as the mods do, it doesn't hurt to have extra eyes and ears around and that can be in the form of vigilant members.
To mwood, the best thing you can do is prove us wrong. Let your presence on the forum be a benefit, add to discussions, start well thought out topics, talk about your kit or an element of the game that interests or confuses you. Bumping two year old threads with single sentence replies is going to get you the attentions of the folks here because we care about the forum. The 50 post selling rule is there to stop people using the forum as a free version of ebay, but just because you get to 50 posts doesn't mean you should suddenly start selling loads of kit either. Play by the rules and people will respect you.