Every NZ brand that gets serious about Amazon eventually faces the same question: who runs this for us? The conventional answer set is short. Hire an agency. Build an in-house team. Or — most common, least successful — keep struggling through it with the founder's spare attention.
There is a fourth option that most NZ founders don't know exists: a fractional Amazon executive. It looks different from an agency and it looks different from an in-house hire. For brands at the right stage, it produces measurably better outcomes than either. For brands at the wrong stage, it's the wrong choice. The honest comparison isn't ideological — it's operational.
What an agency actually is.
An Amazon agency, at its functional core, is a service team that executes Amazon operations against a defined scope of work. The economics: the agency employs Amazon specialists at salary cost, allocates fractions of their time across a portfolio of clients, and charges each client a monthly retainer that exceeds the marginal cost of their allocated time. The retainer + scope-of-work + portfolio-of-clients structure is the agency's business model.
The strengths of this model are real. The agency can hire deeper specialism than a $60k/month brand could justify hiring directly. A senior PPC strategist costs $180k/year; a brand needs perhaps 20% of that person's time, which the agency can sell at $36k/year while the strategist works on five clients in parallel. Specialisation. Cost-pooling. Tool access. These are not small advantages.
The structural limits are also real. Agencies are organised for breadth, not depth. The account manager handling your brand is also handling four to seven others. Strategic decisions arrive as recommendations in a deck, not as choices the operator made on your behalf. Execution happens against a documented scope — anything outside it becomes a change request. Most fundamentally: the agency wins when its monthly retainer continues. Your brand's actual outcome is correlated with that, but not aligned with it.
What a fractional executive is, structurally.
A fractional Amazon executive — a Fractional Head of Amazon — is structurally different. The model: one senior operator owns the strategic direction of your Amazon presence (4 hours/week in the Marketplace OS implementation), supported by a dedicated marketplace manager doing the daily execution (16 hours/week). Total: 20 hours/week of senior Amazon leadership embedded inside your business.
The senior operator is not allocating fractions of attention across a portfolio of seven brands. They work with three to five brands at a time, full-stop. Each engagement is structured around your specific commercial outcomes — contribution margin, market expansion, category position — not against a fixed scope of work.
The marketplace manager isn't an account manager. They are an embedded operator inside your account, doing the listings work, the PPC tuning, the deals execution, the inventory monitoring. They report to the fractional executive, not to a separate account team. The reporting line is short and the decisions move fast.
The structural comparison.
Strip away the marketing of either model and the structural differences come down to four axes:
The cost comparison.
Pure-cost comparison favours the agency at the headline level — a typical NZ Amazon agency retainer sits in the $4,000–$8,000 NZD/month range, depending on scope and number of marketplaces. A fractional Head of Amazon engagement is typically more.
The cost comparison that matters is per-outcome, not per-month. A brand at $50k–$200k USD/month on Amazon doesn't pay a fractional executive for hours; they pay for the contribution margin lift, the market launch executed correctly, the listing problem that didn't become a Seller Support disaster, the deal sequenced for BSR instead of clearance.
For an established NZ brand doing $100k/month, the difference between a 25% TACOS and a 17% TACOS is roughly $8,000/month of incremental contribution margin — enough to fund the entire engagement and produce surplus. The agency-to-fractional decision often pays for itself inside one quarter, if the brand is at the right stage.
When the agency model is the right call.
The agency model is genuinely the right choice in three scenarios. First: when the brand is in its first six months on Amazon and the priority is getting the foundations right — listings up, PPC structure built, FBA flowing — without requiring strategic decisions yet. An agency with a competent setup team handles this well, at predictable cost. Second: when the brand needs deep specialism in a niche workflow (e.g., highly regulated category compliance, complex Brand Registry work) for which a generalist fractional operator would have to research alongside the engagement. Third: when the brand's monthly Amazon revenue is below $40k/month and the unit economics simply don't yet support an embedded senior operator.
When the fractional model is the right call.
The fractional model becomes the right call when three things become true. First: monthly Amazon revenue is above $50k USD and the brand has meaningful contribution margin at stake — the kind of P&L where a 5% TACOS reduction is real money. Second: strategic decisions are pending that an agency wouldn't make on your behalf — market expansion, deal flywheel design, inventory commitments tied to launch sequencing, brand positioning across regions. Third: the brand has multiple marketplaces operating, or wants to.
In other words: for an established NZ brand doing $50k+/month, with multiple marketplaces or plans to add them, where the next year's biggest decisions are strategic rather than tactical — the fractional model produces measurably better outcomes than the agency model, and often at comparable or lower total cost.
The decision framework.
Three questions to ask before signing either contract:
- Who makes the strategic calls? If the answer is "we'll recommend and you'll decide," that's an agency. If the answer is "the operator makes the call inside the engagement, with your knowledge and sign-off where it matters," that's a fractional executive.
- What happens when the next surprise lands? If the answer is "we'll scope and price it," that's an agency. If the answer is "we'll handle it as part of the engagement," that's a fractional executive.
- How is the operator paid for results? If the answer is "retainer + scope," that's an agency. If the answer involves vested interest in the brand's commercial outcome — even informally — that's a fractional executive.
Neither model is universally right. Both produce excellent work in the right hands. The mistake most NZ brands make isn't choosing the wrong model — it's not knowing the second model exists. The fractional executive is the option most brands don't realise they have. That's the gap this writing exists to close.