How exactly are you pitching them? Can you share the pitch. Usually people end up sounding too spamy.
(I am a blogger)
Hello Dan,
Really enjoying your blog. I see you're running adsense at the moment. I'd really appreciate some comments from you on my advertising system. If you're interested I'll set you up with a free beta account. You don't have to commit to putting our ads on your blog, I really just want some feedback from quality bloggers who understand advertising. Let me know if that sounds like something you'd be interested in. Thanks, Samuel, founder of Adclays.
90% chances - I will not write back.
First thing I wanna know - Who are you? Do you read my blog or came across? (1 Sentence
Second What is it for me? (2-3 Sentences)
Third Prove that you are not a spammer (2-3 Sentences) As in talk about blog? How did you find me? Prove that you are a person not a bot. Am I receiving this mail or is it a mass mail?
TALK to me dude. Write as if I am in front of you.
Yes say Hi! "Sup dude?" Whatever makes you human.