Sometimes I think that some of us, that have been here a while, forget that a "forum", by its nature, is to build a community and to do that you encourage dialogue, not ONLY the dispersing of information. The quickest way to END a group is to only have NEW info on it. If the post count gets so low, and the info so thin, no one will be coming by to check all the time. If that's the case, you could just put the info in a list and when someone new comes along refer them to the list. Like the old joke about the guys in prison who had heard ALL the jokes, so instead of telling the joke they would call out "#2" and everyone would laugh.
Perhaps if you see a topic that has been previously been hashed out posted by a new member YOU JUST DON"T READ THAT THREAD, instead of embarrassing them by pointing out that they should have done research instead of posting. If no one responds to a thread, it will die the quick death of dropping off the "list" quickly [which is what happens to most of my inane posts}. and there's always a chance that what the new guys want is to get in the conversation rather than just be informed. Just my opinion.