A bunch of people pay to remove ads, and a bunch of people that are happy to give businesses their attention (view ads) I'm exchange for services... I.e. Gmail, YouTube, but don't feel they use enough / are annoyed enough to warrant $15-25/month.

Some brands are okay with impressions.. you can build trust in your product be advertising it for weeks/months and when the user does make a purchase that brand is on the mind.