I agree with the previous two replies. This is a great site. When I started out I was "invading" the pro forums (that was before the new notices were put up) and was reminded that if there is too much talk from people not in the biz, the pros might lose interest.
I agree, and here's why: I've been a heating and air conditioning pro for the last 3 years. People who are not in that trade have no idea what the work involves, and can be pretty generous with their viewpoints. That's all good, and we should know what they have to say. There is a particular site I've chatted at that is strict about the "pros-only" thing and that is valuable to me, also, because I know those people have work in common with mine; they really know my world. There have been times that that was important.
Whether this site is being too strict or not right now, I don't know. I just try to make sure not to get in the way of professionals' conversations. If you want to say something about a topic that pros are discussing, and you're not in the culinary biz somehow, you can start a thread in a non-pro forum. If you do have expertise in the subject, you might want to express that in the thread title. The intent is not to discourage discussion, but rather encourage it, in appropriate forums. It's not meant to be elitist. Just my 2 cents.