The ROAS Trap
Most ecommerce brands optimise for first-purchase ROAS. They look at how much revenue a campaign generated divided by how much they spent, and if the number is above 2x, they're happy.
This is a trap. First-purchase ROAS tells you whether a campaign was profitable on the first sale. It tells you nothing about whether the customer will buy again, how much they'll spend over their lifetime, or whether your acquisition economics are actually sustainable.
A brand with 3x first-purchase ROAS and 1.2x repeat purchase rate is less profitable than a brand with 1.5x first-purchase ROAS and 4x repeat purchase rate. The first brand is buying one-time customers. The second is building a customer base.
What LTV Actually Measures
Customer Lifetime Value (LTV) is the total revenue a customer generates over their entire relationship with your brand. It includes:
- First purchase - the initial order
- Repeat purchases - subsequent orders over time
- Average order value - how much they spend per order
- Purchase frequency - how often they buy
- Lifespan - how long they remain a customer
LTV is the metric that tells you whether your acquisition spend is actually justified. If it costs £50 to acquire a customer and their LTV is £200, you have a sustainable business. If it costs £50 to acquire and their LTV is £60, you're losing money on every customer.
The LTV-to-CAC Ratio
The single most important metric in ecommerce is the LTV-to-CAC ratio:
- Below 1:1 - you're losing money on every customer
- 1:1 to 2:1 - you're barely breaking even
- 2:1 to 3:1 - you're profitable but not scalable
- 3:1 to 5:1 - you're in the healthy zone
- Above 5:1 - you're under-investing in acquisition
Most brands we audit are at 1.5:1 to 2:1. They think they're profitable because their first-purchase ROAS looks good, but their LTV-to-CAC ratio tells a different story.
How to Improve LTV
LTV is improved through three levers:
1. Increase Average Order Value (AOV)
Bundle products, offer free shipping thresholds, and implement post-purchase upsells.
2. Increase Purchase Frequency
This is where email and SMS infrastructure comes in. Lifecycle flows drive repeat purchase. A customer who buys 4 times a year instead of 2 has double the LTV.
3. Increase Customer Lifespan
Loyalty programmes, VIP treatment, and community building extend how long a customer stays with your brand.
The Infrastructure That Drives LTV
LTV doesn't improve by itself. It requires infrastructure:
- Email lifecycle flows that nurture every customer through repeat purchase
- SMS sequences for time-sensitive and high-engagement communication
- Loyalty programmes that incentivise repeat purchase
- Post-purchase experience that makes customers want to return
- Data and analytics that track LTV by segment, source, and product
This is what we build for every ecommerce client. Not campaigns - infrastructure that compounds LTV over time.
If you're ready to shift from ROAS thinking to LTV thinking, book a strategy call. We'll audit your current LTV and map out the infrastructure needed to improve it.