Opens × clicks among openers
List size times open rate yields reach; CTOR slices who clicked among those opens.
Skipping that step double-counts disengaged subscribers.
More slots mean more restraint
Each sponsorship row adds inbox noise—raise CPM modestly rather than cramming blindly.
Show proof plainly
Sponsors skim geo and cadence—not vanity totals.
Deliver screenshots or dashboards they already trust.
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