Case: a single sticky anchor unit added $2.05 mobile RPM
Finance blog, n=1, 28d, mobile only (73% of traffic). Added one bottom-anchored 320×100 sticky ad. Nothing else changed.
Mobile session RPM $18.40 → $20.45
Incremental unit RPM ~$2.05, viewability 91% (always on screen)
Bounce rate 37.1% → 37.4% (noise)
The anchor is the highest-viewability slot on any layout — it can't scroll out of view. Buyers paid premium CPMs for it.
So what: the anchor earns its keep before any other density move. ▲11.1%
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Case: a single sticky anchor unit added $2.05 mobile RPM
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