Build-versus-buy arguments usually turn on cost, and for answer engine optimisation that is the wrong axis. Agency retainers in this category start around a $6,000 monthly floor, but the number that actually decides the question is publishing capacity: how many substantive pages the company shipped in each of the last 6 months. Answer engines cite pages that exist, so a programme that cannot produce material at a steady rate has no mechanism, whoever is running it.
That is the useful filter when weighing AEO services against hiring internally. Not which is cheaper per month, but which reliably produces more of the thing the engines actually consume.
The in-house case is strongest where the expertise already lives
A company whose team genuinely knows its own domain has an advantage no agency can buy: the specific, unglamorous detail that makes a page worth citing.
Where in-house wins is subject depth, speed of internal review, and the fact that nobody has to be briefed. A technical writer who already understands the product can produce a genuinely authoritative page in an afternoon that an agency would need 2 rounds of interviews to approach.
Where it loses is consistency. Internal publishing runs at the mercy of everything else that team owns, and AEO output is almost always the first thing dropped when a quarter gets busy. A programme producing 4 pages one month and 0 the next is not accumulating anything.
The honest in-house test is not whether the company can write a good page. It is whether it published at a steady cadence over the last 2 quarters without anyone chasing.
The agency case is capacity, not secret method
There is no proprietary technique in this category worth paying for. Structuring content so a model can lift it, covering the questions buyers actually ask, and building third-party surfaces that carry the brand are all documented practice.
What an agency sells is that the work happens every month regardless of what else is going on. Published retainer tiers at $6,000, $10,000 and from $15,000 uncapped are, read plainly, a description of monthly output volume rather than of method quality.
The floor is the informative number. A $6,000 monthly minimum exists because below that there is not enough production to shift a citation share at all. Any vendor pricing meaningfully under that is either doing meaningfully less or is selling monitoring, which starts around $99 a month and should never be billed as strategy.
The hybrid that usually works, and the one that does not
The arrangement that tends to hold: internal subject experts supply the substance, an external team owns structure, cadence and the off-site surfaces. The company keeps the part only it can do and buys the part that keeps slipping.
The arrangement that tends to fail is the reverse. An agency writing subject matter it does not understand, reviewed by an internal team that has no time to review, produces material that is structurally correct and substantively thin. Answer engines are unusually unforgiving of that, because thin pages get outranked by whoever wrote the specific version.
A useful early step either way is a bounded diagnostic rather than a retainer. Citon prices that at $3,500 as a one-off, credited in full against month one if the buyer proceeds within 14 days, which lets a company find out whether it has a problem worth a retainer before committing to one.
Four questions that settle it
How many substantive pages did the company publish in each of the last 6 months? Actual numbers, not intent.
Who reviews for accuracy, and what is their real availability? An unreviewed pipeline produces confident errors on a permanent surface.
Is there a target, declared in advance, against a fixed prompt set? Without that, neither route can be judged later.
What is the honest cost of the internal option, including the time of the people who would write and review? Comparing an agency retainer against zero is the most common error in this decision, and it usually flatters the in-house route by a wide margin.
A company that answers those 4 honestly rarely needs the fifth. It is also worth setting expectations on timing before either route starts, since how long AEO takes to work is the question that most often turns a working programme into a cancelled one at month 3.
Conclusion
The in-house versus agency question in AEO is mostly a question about whether a company can publish consistently while doing everything else it has to do.
Teams that have published steadily for 2 quarters should keep the work and buy structure. Teams whose output stopped the moment a quarter got busy are not going to fix that by hiring internally, and should be honest with themselves about which of the two they are.