You hear their stories and life concerns, so in a way it becomes a reflection of story telling becoming story telling. From everything I've learned there is no replacement for the drama called life. Newcomers are always welcome. In my case, I've had a lot of requests for my screenplays from posting loglines on the net. But I do understand it's not for everybody.
People are still very concerned about posting their material if only a logline on line.
And always check out someone before you send your material. But I do think it's important to stand out. I know for a fact there are producers and agents out there hitting the search engines and screenwriting sites looking for material, and more and more are jumping on the web everyday. It's only going to take one or two high profile sales from some screenwriters on the Internet to really open the doors for writers out there in cyberspace. The Hollywood Creative Directory is the first place for me.