Ad-ops question with a real tradeoff: sticky and floating ad units, the ones that stay pinned to the screen as you scroll, a fixed bottom bar, a floating sidebar unit, a video that follows you down the page. the case for is they get far more viewability and time-on-screen than a static unit that scrolls away, so they genuinely earn more per placement. the case against is they are intrusive, they eat screen space especially on mobile, and they can push people to leave or block harder. so do sticky units actually net more once you account for the retention and bounce cost, or is the extra per-placement revenue an illusion that the lost sessions cancel out, and if you run them, what is the line between a sticky unit that earns and one that drives your audience away?
the viewability lift is real, a unit that stays on screen the whole session gets seen way more than one that scrolls out of view in two seconds, and viewability is a big part of what a placement is worth. so yeah, sticky genuinely earns more per placement. the only open question is whether that gain survives the retention cost, and that’s a whole-session measurement, not a per-unit one.
where sticky units flip from earner to liability is eating screen space, especially on mobile. on a phone a fixed bar or floating unit covers a real chunk of a small screen, so the intrusion cost is way higher there than on desktop, and the same unit that’s fine on a big screen actively hurts the mobile experience. be far more cautious with sticky on mobile than on desktop. make the decision per device, more freely on desktop where there’s plenty of screen, sparingly on mobile where a fixed unit eats the limited space and can bounce people off the content they came for. treating sticky the same across devices is how you tank the mobile experience it’s riskiest for.
exactly the test, and it has to be a session-level holdout, because the sticky unit’s own numbers always look great on viewability. run it on half your traffic and not the other half, then compare revenue per session and repeat visits. it’s frequently a win on desktop and a loss on mobile, and only the holdout tells you which way it goes for your traffic.
a video that follows you down the page is the most intrusive and most performance-heavy sticky format there is. a floating video unit is both the biggest screen intrusion and a continuous load of video and scripts running the whole time the user scrolls, so it hits retention and page performance at the same time, worse on mobile. of all the sticky formats it’s the one most likely to bounce users and slow the page, so it should face the highest bar if you test it. the people who run it successfully are careful about its size and placement precisely because it carries both the retention risk of the intrusion and the performance cost of the continuous media, a double cost the per-placement revenue has to clear to be worth it.