Keyword Exchange for Dofollow Blogs: Idea

I got a great "Keyword Exchange" idea from one of my commenters: as a Dofollow blog I will get instant readership that I would otherwise not have (good for all). However, some of the commenters will be here just to place comments with their keywords in the name field (good for them) and not read or contribute to the post (not good for me or the dofollow movement). So I kept the "Post a Comment" line and placed the following wording in place of the generic warning:

Post a Comment

This is a DoFollow blog. Comments that contribute nothing will be deleted. Keyword exchange: If you are placing your keywords in the Name field I request that you read the post and place my keywords from the post title or text in your comment.

I will write about the procedure to make this change in my blogger in my next post.

Hopefully the "Great post mate" comments will turn into more thoughtful comments. Or at least longer and more keyword rich comments ;)

Your comments on the keyword exchange idea? Do you feel it is easy for you as a commenter to follow? Do you like it? Is it a fair exchange? Will it help increase the dofollow movement? Post your opinion in a comment and let me know!