Now I'm wondering, which will be most profitable for me...sending them a backend promotion through email or through direct mail? (or both?).
The good thing about email is that it's free. The good thing about direct mail (I suppose), is the open-rates etc.
But then again, I'm not in the IM niche. I think the open-rates for my emails to this list will be pretty good, as they're not really used to getting promotions.
What do you think?