What is an .edu backlink worth?

Well I should ask, what is my .edu backlink worth to you? Nothing I haven't linked you up. The other question should be, Why do you persist to leave your website link in my comments area to websites that are not relevant to the blog post I wrote? Third and I believe lastly, Why would I hook you up if you know your website is not relevant to the blog post. Do some SEO work. My website is not relevant to any medicine that will make men happy and woman disappointed by its effects of it there of.