I don't have a copyright notice below my website because it's not needed in order to have copyright on your work. However I also won't explicitly allow people to copy all of my work. In most cases it's entirely flattering, but for the times that it's not, I do remain legally entitled to have the content removed (or have the design or anything else removed). Moreover, a copyright notice affects the entire page. I bet you didn't think about comments that are posted by users, they now fall under your copyright (or explicit share-right) as well. Do you really want to licence user data that way?