I think this is an awesome idea. For example, I have a milk stout recipe that if you just read the recipe, it looks like a bit of a complicated mess. But everyone who has tasted it loves it, everyone who has brewed it loves it, and when I created it, I had reasons for including exactly what I included. Having a site which included the recipe but ALSO included notes from the brewer about why specific choices were made is important.
Well, that depends. You'll notice that EVERY page in this forum has a copyright of homebrewtalk.com at the bottom of it. You don't get copyright JUST because it's your original content. Original content that you post on this forum is owned by Homebrewtalk.com.
If you create original content on your own web site, you own that copyright. But generally it would cause all sorts of legal issues for an online forum to grant copyright to every individual user. So HBT owns everything posted here, even if it's your content.