Scaling at different stages of the funnel

Quick Answer

Each funnel stage has different scaling dynamics. TOFU (cold prospecting) scales with creative volume and broader audiences. MOFU (engaged but unconverted) scales with frequency caps and varied retargeting creative. BOFU (cart abandoners, recent visitors) scales with offer testing, not budget. Pushing budget into BOFU without offer changes will tank ROAS quickly because the audience is finite.

The Framework

1. TOFU: scale with creative + audience width

Cold prospecting absorbs scale through new creative and broader audiences. There are millions of potential customers. The constraint is reaching them efficiently — and that comes from creative variety. Add new concepts weekly. Push budget.

2. MOFU: scale with creative variety, not budget

Mid-funnel audiences (engaged with content, page visitors) are larger than BOFU but still finite. Adding budget without new creative creates frequency problems. Add new creative angles weekly and scale budget gradually.

3. BOFU: cap budget, scale offers

Bottom-funnel audiences (cart abandoners, recent purchasers excluded) are tiny. There's no point throwing $5k/day at them — you'll just hit each person 20 times. Cap BOFU at 10-15% of total spend and improve performance via offer changes.

4. Check stage-by-stage frequency

TOFU: target 1.5-3.0 frequency per week. MOFU: target 2.0-4.0. BOFU: 3.0-6.0 is acceptable but anything higher is harassment. Use frequency as your scale signal per stage.

5. Use different optimisation events per stage

TOFU optimise for purchase. MOFU for purchase or initiate checkout. BOFU for purchase only. Don't optimise BOFU for cheaper events — you'll fill the funnel with people who never buy.

6. Build dedicated retargeting creative

BOFU/MOFU creative should look different from TOFU. Direct, urgent, often discount-led. Don't reuse cold creative for retargeting and expect it to work — the audience already knows you.

Real Numbers from the Field

A subscription brand we worked with had been running 65% of budget on retargeting because 'it converted better'. We moved to a 75% TOFU / 15% MOFU / 10% BOFU split. Initial week ROAS dropped 8% as TOFU caught up. By week 6, total account ROAS was up 14% because BOFU was no longer being over-fed and incremental TOFU conversions were finally entering the funnel. Account spend grew from $6k to $11k/day over 4 months.

Frequently Asked Questions

What budget split should I use across funnel stages?

Common starting point: 70% TOFU / 20% MOFU / 10% BOFU. Adjust based on your retargeting audience size — smaller audiences mean less BOFU budget.

Should I run separate campaigns for each stage?

Yes. Different audiences, different creative, different optimisation events. Mixing them in one campaign produces noise.

Can Advantage+ Shopping handle the whole funnel?

ASC handles cold and a portion of warm — set the existing customer cap appropriately. Pure BOFU (cart abandoners) still belongs in dedicated retargeting campaigns.

How do I scale BOFU if budget is capped?

By improving the conversion rate, not by spending more. Test better offers, urgency, social proof. BOFU scaling is a CRO problem more than a media buying one.

What's the biggest funnel mistake at scale?

Over-investing in retargeting because attribution makes it look profitable. Most retargeting is taking credit for purchases that would have happened anyway. Hold-out tests reveal this fast.

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