I’ve spent most of my career on retention, so this chapter is an argument with myself. The evidence says that brands grow mainly by winning more buyers, not by making existing buyers more loyal. Retention still matters enormously. It just matters for a different reason than most retention people claim.

Double jeopardy

In 1963 a sociologist named William McPhee described a pattern in popular culture: less-known entertainers had fewer fans, and those fans also liked them slightly less. Andrew Ehrenberg and colleagues later showed the same pattern, which McPhee had named double jeopardy, across many consumer categories. Smaller brands have far fewer buyers, and those buyers are also slightly less loyal Published. Byron Sharp’s How Brands Grow (2010) made it famous outside academia.

The practical meaning is this: when a brand grows, it’s mostly because it reached more buyers, and loyalty rises a little as a side effect. Loyalty doesn’t come first. Research from the same institute estimates that winning new buyers matters roughly twice as much for growth as reducing defection Published.

Brands grow by winning more buyers. Retention decides whether those buyers are worth winning.

Where retention fits

If growth comes from penetration, why build a retention program at all? Because retention changes what each new buyer is worth, and therefore how much you can afford to pay for one. A brand whose second-order rate goes from 20% to 30% hasn’t grown by itself. It has raised the price it can pay for the next thousand new customers, which lets it outbid competitors for the same attention. Retention is the fuel. Reach is the engine.

This also explains a common trap. A team fixes its flows, repeat revenue rises, total revenue looks healthy, and new-customer counts quietly fall because paid spend was cut to “let retention carry it.” A year later the returning base has thinned, and there’s no new base behind it. The share of revenue from returning customers going up is only good news if new customers aren’t going down.

Brand and activation

Les Binet and Peter Field studied the UK’s IPA effectiveness database and found that, on average, the most effective campaigns split budget about 60:40 between long-term brand building and short-term activation Published. Their 2018 update put it at 62:38, and the IPA is clear that the right split varies a lot by category. Treat it as an average from mostly larger advertisers, not a rule for a two-year-old DTC brand.

The useful idea underneath is that some spend creates demand and some spend harvests it. Most DTC ad accounts are almost entirely harvest: retargeting, lookalikes of buyers, and prospecting optimized for a purchase within a week. That works until the pool of people already primed to buy is used up, and then costs rise for no visible reason.

What to do with this

• Count new customers every week, not just revenue. It’s the one number that measures penetration directly.
• Exclude existing customers from prospecting campaigns. Otherwise the platform finds your cheapest conversions among people who already buy from you, and your new-customer cost looks better than it is.
• Fund some reach you can’t attribute. Creators, video views, sponsorships, whatever fits the category. Measure it with a holdout or a geo test, as in chapter 8, not with last-click.
• Judge retention on what it does to new-customer economics: second-order rate and payback, not the share of revenue it touched.

Do this

• Pull new customers per month for the last 24 months. If the line is flat or falling while revenue rises, your growth is coming from a base you’re no longer refilling.