You cannot do that here at WordPress.com. In fact you need to get up close and personal with the Terms of Service and the policies here.
Blogs that are not allowed:
Affiliate marketing blogs: Blogs with the primary purpose of driving traffic to affiliate programs and get-rich-quick schemes (“Make six figures from home!!”, “20 easy steps to top profits!!”, etc). This includes multi-level marketing (MLM) blogs and pyramid schemes.
Automated blogs: Blogs that are generated by computers, including randomly generated blogs, blogs that re-publish press releases, marketing material, search engine results, link dumps or any other mass-produced content. http://en.wordpress.com/types-of-blogs/
Here's what gets a free hosted WordPress.com blog suspended: