I recently had 200 dofollow blog comments done and noticed a 5 position dip in my main keyword. Do you believe too many blog comments on unrelated pages hurts your SERPs?
That's hard to tell. Adding links too fast can also affect SERPs and using the same anchor text can also be bad. Then again, it could be a regular Google dance.
It can make google penalize you, because of to much links. But for a 5 position drop is just a google dance.
i doubt that's case. Adding a bunch of links could get you sandboxed but a drop of 5 spots is nothing. my rankings can vary a few spots during the day. better to spend your time building more backlinks than checking your rankings.
Is not about the amount of blog comments, is about the outbound links.... remove the links of the comments... to see what happens.