I will say i like how the classifieds are ran now. If someone has something for sale I can read the post and determine if it is something i am interseted in, without filtering through replies asking for pictures, dimensions, etc.
The 30-post rule is just fine as well. I have no clue on now to build a duck boat (or any seaworthy craft for that matter), no clue on crafting a decoy (but i am working on a canvas one), and i only have a few years of waterfowling under my belt. All that doesn't prevent me from from chiming in where i can, even if its nothing more than admiring a decoy, photograph, or otherise insightful post.
So, my advice to anyone is to join, learn, and contribute where you can to make this site one that all can enjoy.