When the game is at this stage it's better to just not play.

When an advertising platform has to pay fartsniffers to follow you around to offer marginally better ctr than email spam, maybe just don't run ads?

Work manually on growing networks of users, actually walk up to them and chat, talk in relevant business forums and you won't spend thousands of dollars you don't have casting a net in hopes of finding people who more likely than not just don't want to be associated with your practices.