Mainspring Boutique
Mainspring Boutique sells premium timepieces from AVI-8, Earnshaw, Nubeo, Spinnaker and Atari to discerning buyers across the UK and beyond. The brief: scale Meta advertising profitably, and measure it by the only number that tells the truth, real Shopify revenue.
A luxury watch brand, measured on real revenue.
Mainspring Boutique runs a direct-to-consumer Shopify store built on curated collections of aviation-inspired, mechanical and fashion watches. Average order values sit near £186, with consideration cycles that run days or weeks, not minutes.
We managed their Meta advertising across a three-level funnel and judged it on Marketing Efficiency Ratio, total Shopify revenue divided by total ad spend. Over four months that approach returned £259,375 on £29,867 of spend, an 8.68x MER at a true £21.41 cost per order.
Last-click was hiding the real result.
For luxury products with long consideration cycles, platform attribution undercounts. Mainspring needed a measurement model that reflected actual business impact, not just last-click.
Platform blind spots
Meta's last-click attribution captured only part of the journey, crediting 314 purchases when Shopify recorded 1,395 real orders.
Long consideration cycles
Luxury buyers research, compare and revisit over days or weeks. Single-touch models miss the ad that started the journey.
Cross-device behaviour
Customers browse on mobile, buy on desktop, and often return by typing the URL directly, traffic last-click never ties back to advertising.
Measure on truth, then build the funnel around it.
Two metrics anchored every decision: real return on spend, and the real cost to win a paying customer. The funnel was built to serve both.
Marketing Efficiency Ratio
Total Shopify revenue ÷ total ad spend. The north-star metric, showing true return regardless of attribution limits. At 8.68x, every £1 of spend returned £8.68 in revenue.
Shopify-based CPA
Total ad spend ÷ total Shopify orders. The real cost to acquire a paying customer, £21.41, not the inflated £95.12 the platform reported. This metric guided every scaling decision.
Three-level funnel architecture
Level 1 · Cold Traffic
- 1% lookalikes built from purchasers
- Interest targeting: watch enthusiasts & luxury buyers
- Broad targeting with Advantage+ optimisation
- Dynamic catalogue & brand-specific creative
- 147 purchases · £150.10 CPA · 67,314 clicks
Level 2 · Retargeting
- Website visitors, 7 to 30 days
- Video viewers, post engagers & email lookalikes
- Add-to-cart abandoners with urgency messaging
- Dynamic retargeting of viewed products
- 166 purchases · £44.55 CPA, the best · 23,608 clicks
Level 3 · Cart Recovery
- Hyper-targeted checkout abandoners
- High-intent reminder creative
- Minimal spend, maximum precision
- 3.77% CTR, the highest of any level
- Proof that intent beats budget
£259,375 on £29,867 of spend.
1,395 orders at a £185.93 average order value, an 8.68x return measured on real Shopify revenue.
Shopify revenue growth · Jan to Apr 2025
Why MER, and what last-click missed.
The gap between platform metrics and Shopify truth is exactly why blended measurement mattered. One view nearly tripled the apparent cost of a customer.
The multi-touch customer journey
Initial exposure
A customer discovers Mainspring through a Meta ad showcasing a watch collection. They click, browse, explore products, but do not buy on the first visit.
Research phase
They research brands, read reviews and compare options. Multiple touchpoints land across days or weeks as they weigh a premium purchase.
Retargeting
Retargeting ads remind them of the products they viewed. The brand stays top-of-mind through the consideration period.
Conversion
They return, often by typing the URL directly or via search, and complete the purchase. The whole journey was ad-influenced, and only MER captures it.
The right metric changed the decisions.
More success stories.
The numbers behind the campaigns. Pipeline generated, deals closed, revenue moved.
£259,375 in revenue at an 8.68x MER.
From a standing start to 3,200 customers in 47 weeks.
Scaled to $277k a month at a 7.1x ROAS.
362 → 768 → 1,150 booked calls a month, year-round.
Five summits sold out on £20K of ad spend.
Word-of-mouth business turned into a paid pipeline.
£102k profit in 10 months at 3.43x ROAS.
ARR doubled, demos tripled.
Stop hoping for leads.
Start building the system.
We specialise in helping businesses generate more leads and sales through online advertising campaigns. A 30-minute strategy call, no pitch, just a clear path to qualified calls every week.
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