Definition
Teaser ads are a low-cost display format built around a provocative image and a curiosity-gap headline - an odd picture, a partial claim, a "you won't believe" hook - designed to make the viewer click to find out more. They run on teaser networks that aggregate cheap inventory across content sites, particularly in CIS and other emerging markets, and they are priced low per click with high volume and low intent.
The format is essentially clickbait as an ad unit. The image and headline do not describe the offer honestly; they create an itch that only clicking scratches.
This produces cheap clicks in quantity, but the traffic is disengaged and often mismatched to whatever it lands on, so conversion depends heavily on a prelander that bridges the gap between the teaser's hook and the actual offer.
In context
For iGaming, teaser traffic is a grey-leaning, low-quality channel used mostly for cheap Tier-2/Tier-3 casino acquisition where volume compensates for poor conversion. The economics only work with tight source filtering (teaser networks carry a lot of bot and forced-click inventory), a fast prelander that gives the clicker a reason to continue, and a downstream target (cost per FTD) rather than cost per click, since the click volume is meaningless on its own.
Teaser ads also carry compliance and brand risk. Curiosity-gap headlines that imply guaranteed wins, misrepresent the offer, or use shock imagery breach advertising standards in regulated markets and most network policies, and teaser inventory often sits on low-quality or unsafe sites that an operator would not want its brand associated with.
Licensed operators generally avoid the format; it persists in grey affiliate media buying for markets and offers where cheap volume is the priority and brand safety is not a concern. Where it is used, the prelander is doing almost all the work, and the teaser is just a cheap way to buy attention.
Worked example
An affiliate runs teaser traffic in a Tier-3 market to a news-style prelander that reframes the curiosity hook into a real casino comparison. Raw click-to-registration is 0.4%, but at a $0.03 cost per click the cost per registration is workable, and after a source blacklist removes the worst 50% of inventory, cost per FTD lands at $19 for that GEO.
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