Why a Lack of Transparency Is Undermining Programmatic Buying

Online display advertising has been transformed over the past decade, and programmatic media buying sits at the centre of that transformation. The efficiency gains are real — automated decisioning, real-time optimization, audience targeting at scale — but so are the structural problems the model has introduced.

Ad fraud alone is estimated to cost advertisers $6.5 billion annually. Privacy, brand safety, and inventory quality remain persistent concerns. And then there is the issue that brand executives consistently rank as the number-one challenge in programmatic, according to AOL research: transparency, or more precisely, the chronic lack of it.

What Non-Transparent Programmatic Looks Like in Practice

In traditional direct media buying, both the advertiser and the publisher knew exactly what the media was being bought and sold for. That directness still exists in some corners of the market, but the efficiencies offered by technology platforms — DSPs, SSPs, DMPs, ad exchanges — have driven a broad shift toward programmatic, for both remnant and premium inventory alike.

The trade-off is that those same platforms have inserted themselves as intermediaries between buyers and sellers, and in doing so, have made the true cost of media genuinely difficult to trace.

When an advertiser places a buy through their agency, they often have little visibility into how many hands that budget passes through before an impression is served. It is not unusual for an ad to move through five distinct parties before it ever reaches the publisher. Each of those parties takes a cut.

A typical programmatic chain looks like this:

• An advertiser engages a media agency.
• The media agency routes the buy to an agency trading desk.
• The trading desk manages the campaign via a DSP.
• The DSP connects to an ad exchange, which layers in third-party data from a DMP.
• The ad exchange draws inventory supplied by an ad network or SSP.
• The impression is finally delivered to the publisher.

The Commission Problem

Knowing the exact margin each layer of the stack is taking is extraordinarily difficult — and even when that information is provided, validating it independently is harder still.

DSP commissions, for example, range from as low as 5% to as high as 50%, with the industry average hovering around 20%. But advertisers are typically shown only the CPM price — $10 per thousand impressions, say — with no breakdown of what share the technology platforms are keeping versus what actually flows through to the publisher.

The cumulative effect of stacked commissions is stark. An advertiser purchasing inventory at a $5 CPM can see up to 75% of that figure absorbed by intermediaries and technology fees, leaving only 25% — $1.25 CPM — reaching the publisher. The advertiser believes they are paying $5 for ad space; in practice, they are paying $5 for ad space worth $1.25 on the open market. That gap is rarely disclosed to either party.

Publishers are caught on the other side of the same problem: they are not receiving fair market value for their inventory, and they frequently have no mechanism to verify what buyers actually paid.

The data layer adds another dimension. Advertisers who purchase third-party audience, contextual, or verification data through a DMP may be quoted a data cost, but the DSP routing that data may quietly add a margin on top of the disclosed price — an undisclosed spread the buyer has no easy way to detect.

The issue surfaced publicly when The Guardian newspaper sued the Rubicon Project, alleging the company had failed to disclose fees it was earning from advertisers running on The Guardian's inventory. The lawsuit was a signal that this kind of opacity carries legal as well as commercial risk — and it almost certainly will not be the last case of its kind.

What This Costs the Ecosystem

The downstream effects go beyond individual advertisers feeling short-changed. The opacity is eroding trust across the entire programmatic supply chain.

Perhaps most consequentially, both advertisers and publishers are finding it increasingly difficult to calculate ROI with any confidence. When the actual cost of media delivery is obscured by layers of undisclosed fees, performance measurement becomes unreliable. Advertisers are left uncertain whether underperforming campaigns reflect poor strategy or simply money being lost in transit. Publishers cannot reconcile what buyers claim to be paying with what lands in their accounts.

That uncertainty is causing some buyers and sellers to pull back from programmatic entirely — which is precisely the opposite of what a maturing ecosystem should be experiencing.

A Path Forward

The transparency problem is not technically unsolvable. The supply chain mechanics are well understood; what is lacking is the commercial incentive and regulatory pressure to surface them.

A reasonable starting point is education: advertisers need a clearer understanding of how each technology layer in the stack operates and, specifically, what it costs. That requires platform vendors to present fee structures in plain terms rather than burying them in opaque contractual language.

Beyond individual disclosure, the industry needs clear, enforced guidelines that establish what pricing transparency looks like across the programmatic supply chain. That means applying sustained pressure on technology vendors to publish and validate their fee structures — not as a courtesy, but as a baseline condition for operating in a functioning marketplace.

The programmatic model has genuine advantages. But those advantages are being steadily undermined by a culture of opacity that serves intermediaries at the expense of the buyers and sellers the system is supposed to connect.