Advertisers move media buying in-house, then move it back out, then repeat the cycle. Each move is justified on its own terms, and the reversal is built into the reasoning.
The case for bringing it inside is real
Agency fees are a visible percentage of spend, and removing them appears to convert overhead directly into working media.
Internal teams also have direct access to first-party data and to the commercial context, without the delay of briefing an external party.
Control over the buying platform means changes happen immediately rather than through a request queue, which matters for anything responsive.
Fixed cost replaces variable cost
An agency fee scales with spend. Salaries do not, and they continue during periods when media budgets are reduced.
When spending falls, the internal team becomes proportionally more expensive at exactly the moment cost is under scrutiny.
That timing is what turns a sound decision at one budget level into an obvious target at another.
The saving on fees also assumes the internal team is as effective as the agency it replaced, and any shortfall in performance is a cost that never appears alongside the salary line.
Specialist skills are hard to retain in one company
A single advertiser can offer a specialist one account and one category, which limits both the variety and the career progression available.
People who want breadth leave for agencies, and the knowledge leaves with them, since it is rarely documented.
Replacing a departed specialist is also slower internally, because the role is a single hire rather than a reallocation from a bench.
Platform change outpaces internal capacity
Buying platforms change continuously, and staying current requires exposure to many accounts and continuous vendor contact.
A small internal team sees only its own account, so gaps in knowledge appear slowly and are noticed only when performance drifts.
Agencies amortise that learning across many clients, which is the genuine service being purchased and is easily mistaken for administrative overhead.
The stable arrangement is usually a split
Most advertisers converge on holding strategy, data ownership and platform contracts internally while contracting execution capacity externally.
That structure keeps the assets that compound in-house and the labour that fluctuates outside, which matches each cost to its behaviour.
It is less satisfying than a clean decision in either direction, and it is the arrangement companies tend to arrive at after going around the cycle twice.