Spam is not just recognized by relative quantity, as I understand it most people subscribe to the idea that if a comment is only promoting something else then it is spam. Even if you do this once, it is spam.

I got into a discussion with your commenters on the subject and tailored the information to the context, and that made it not spam, though I was promoting a back link to my own work.

Anyway thanks for answering my queries and good luck.