Blog Commenting Project - Pet product industry related

We have sites where you'll need to find relevent topics to place comments with our backlinks. These are sites with high PR where comments are auto-approved if the comment is relevant and not considered as spam (stuff like "great site", "nice post", "excellent comment") You might need to register one some of these sites to make a post. This is the first commenting posting project we're posting, and we will pay $50 for 500 live comments as a starter, future projects can be arranged depending on the performance of work Here are the requirements for this project: 1) Comments MUST NOT look like spam, so you need to skim read the blogpost and leave a relevant comment with at least 20 words/2 sentences in it. 2) Comments MUST be hand written and unique - if the comments are alike or some soft has been used to leave them, I won't pay for them (though you are allowed to use roboform to fill in name/email/website fields). 3) Back links must contain given anchor text 4) Please provide previous work on related project for consideration