Do you approve comments from names which include keywords? Should we approve it or not? Here is what you can do if you are in a confusion about approving a comment from keyword spammers or deleting it. Read the article on what kind of commentators are safe to be approved and who are the ones which require a kick out of your comment section.
If you want to get a hyperlink, its worth only when it is not a nofollow link. Here is the easiest way to test if the links are nofollow or dofollow.