Hello Imran,
Thanks for sharing such a great information. Most subscribers hate receiving mails about offers everytime. It is easier for people to opt-out of your list than opting-in. What I do most is to give bonuses, free reports, ebooks (freebies) in the mails I send out and some response with thanks, even interact with me, ask questions and build relationship.
Warm Regards
Olusegun Balogun