What do you think would happen if everytime you went out to lunch with your prospect, let's say once each month, and you tried to sell them something? My guess is they'd stop having lunch with you.
I't's the same with newsletters, look at the similarities when we send out our newsletters. Our newsletters are the face to face interactions we would have if we weren't doing it digitaly.
So focusing on more sales at the expense of the relationship will wipe out both. (Relationship + Sales)
I'ts certainly ok to talk about what you do, bu it can't be the center of the conversation. As far as your e-newsletter goes it becomes nothing more than a telemarketing call in disguise, and they will unsubscribe, putting an end to any future sales.
Turn off the selling machine, a good newsletter focuses on offering relevant, useful, interesting information to your readers, with emphasis on providing-not extracting-value. :p
What are your thoughts on this?