I recently started using AdRoll for re-targeting. While the use interface is slick and campaign creating is a breeze, I don't like the fact that I can only pay for impressions. In a few days I racked up $100 in spend with only a single click.
The customer support team told me they only do "Dynamic CPM", meaning it is not possible to only get charged for clicks. Are there re-targeting platforms where you only pay for clicks?