Not if you've already converted. Those are likely wasted impressions that drag down numbers, not improve them. Often what can happen is you can have retargetin

Not if you've already converted. Those are likely wasted impressions that drag down numbers, not improve them. Often what can happen is you can have retargeting lists setup that populate automatically, but depending on how they are implemented, how frequently they are updated, etc., they may have set things up as exclusion lists properly (or even just removed people from the retargeting list). Likewise, that data may not carry over super well across devices in all cases. This stuff can be a headache to setup and maintain, particularly at scale, and I think a lot of people don't realize the complexity of what is involved when they haven't done it themselves.