No, Group 1 describes users who are interested in your product but, for whatever reason, have not yet made the purchase. Maybe they're on the fence about whethe

No, Group 1 describes users who are interested in your product but, for whatever reason, have not yet made the purchase. Maybe they're on the fence about whether they need it, or are deciding between two or three products. The purpose of the emails is to help tilt them over to making the decision to go ahead with the purchase. Users in group 2 are never going to be interested enough to purchase the product. No email will convince them to. That's why whether you "spam" them or not (I would argue that it is not spam if you gave the site your email address with the understanding you may get emails from them) they are not going to purchase your product, so what difference does it make if they are annoyed by the emails?