Many top bloggers have apparently been using it for months in secret. I signed up the Blogging Tips Twitter account to it but so far but have not had any interest from advertisers as yet so it’s difficult to say what the return is like from using it.

Thanks for the warning. I won't be following Blogging Tips on Twitter, and I've blocked Blogging Tips as well.

Using spam injection services devalues your brand, and costs you credibility.