Seriously though, this "tight community" may be a little too tight. It seems a little too much like a small clique to be honest from someone who lurks alot. Same twenty dudes posting over and over and de-railing threads and posting off-topic constantly.
the community is what you make of it. If everyone is a lurker, the site would quickly die a spectacular and
silent death. like it or not, the active members who participate (and often derail) are what keeps the forum interesting, and more people coming. I've been part of numerous forums where there would only be 1 or 2 new topics a day, and myabe 10 new posts. as soon as that's an established pattern, no one comes to the site anymore, except maybe once a week. why would a sponsor bother trying to sell something, if they can only count on a dozen eye balls on their ad a day?
For the heath of the forum, I'd say reserve the judgement on newcomers and if they hit the required post count and follow TOS then let them be....For Sale threads are not the end of the world...
for the health of the forum, the mods delete posts which are blatant attempts to pad their post count with "thanks", "good point", "i agree", "nice price", "GLWS!", etc, because those people generally are not interested in the community, but only profiting FROM the community.