Good comments that are relevant to your blog are important for search engine ranking. Google is not fooled by drive by blog post that say, "Great post," or something similar. If you are blogging and want traffic from search engines you have to have good interaction on your blog.
For the comments:
You can furnish 1 keyword you want me to use and I will work it into the comment.
I guarantee what I do. If there is a comment you do not like I will remove it and replace it with another comment.
If you like the work you can reorder the gig for other comments or future post so that you have a regular commenter on your blog.
If I feel that I cannot give you good comments on your blog I will immediately refund your money.
Thanks