The Art of Customer List Growth
Most DTC brands treat list growth as a numbers game: more signups, more revenue. But a list built on volume alone is often a liability, not an asset. I've seen brands double their signup rate and watch their Welcome flow revenue collapse in the same quarter — because the new "leads" never intended to buy, open, or engage in the first place. Quality sign-ups, not just sign-ups, are what actually grow a business.
Here are the five channels that matter most, what I've seen work, and where they go wrong.
1. Make signing up easy and intuitive
There are three key areas to collect email and SMS consent, and each behaves differently.
Site popups
Having worked with multiple DTC brands, this is still the most impactful way to collect email and SMS consent — but it's also the easiest way to inflate list size and damage revenue per send (RPE).
Most popup vendors that integrate with Shopify, and even Klaviyo are now offering some gamification functionality: spin-the-wheel, flyouts, page takeovers, scratch cards, quizzes. These reliably increase signup volume but here's the catch: volume goes up, quality goes down as intent wavers.
I tested this directly for a client — spin-the-wheel gamification vs. a static popup with the same offer. The spin-to-win version drove more signups, but produced a 60% decrease in click rate and a 55% drop in Revenue per Email for the Welcome flow. Signups went up; the people behind them never came back to visit the site, opened an email, or engaged with SMS after that first interaction. We also tested sending campaigns to this group, and saw minimal revenue and a click rate as low as 0.12%.
Two rules of thumb:
Don't block the shop. A popup that fires within a second or two of landing on site, or reappears on every page reads as a disruption, not an invite — and it puts people off the brand entirely when they can’t see what they initially visited for.
Test timing by page. A customer browsing the homepage behaves differently than one on a product page. Your popup logic should reflect that, not treat every visitor the same.
Offering a discount Discounts boost signups, but they need to be tested for incrementality, not just conversion rate. I’ve dived into Klaviyo customer data and seen an initial site interaction, followed by email sign up just for the discount. How do I know? When the email wasn’t received immediately following the submission, they called customer care for their code. This is exactly why you test when the popup is shown.
10% off works fine for lower-AOV brands. At a $100+ basket size, that same discount compounds into real margin loss over time.
A free gift with purchase can work well too — especially for moving an accessory that isn't selling on its own, or something desirable and low cost to produce.
2. Persistent site presence
This method sees lower volume than a popup, but higher intent. A prominent, always-available signup spot (footer, nav, sticky bar) lets a customer opt in on their own terms, on any page, without being interrupted.
This matters most for brands with a longer consideration window — think furniture, fine jewelry, or anything with a higher price point. These are exactly the browse-abandon customers a popup would otherwise never catch, because they're not ready to buy on visit one. In practice, I've seen persistent-presence signups convert at a noticeably higher rate down the funnel than gamified popup signup.
The trade-off: don't expect this method to move your total signup volume much, its job is quality, not quantity.
3. Cart & Checkout
Cart and checkout signups can drive a meaningful share of your list, but usually only when a) a popup isn't present, or b) a discount isn't already on offer elsewhere in the funnel.
I've worked with DTC clients where nearly 80% of automated email revenue came from the Welcome flow — but only when a promotion was the incentive to sign up (Shibumi Shade). Flip that: brands with no signup incentive see the majority of their list growth happen at cart and checkout instead (Walmart eCommerce). That shifts the job of this channel entirely — it's no longer a discount-driven acquisition play, it's your best tool for nurture and cart/checkout recovery further down the funnel.
The practical implication: don't treat every checkout signup the same way you'd treat a popup signup. This person is already in a buying mindset — your first message to them should reflect that (recovery, confirmation, cross-sell), not repeat a generic welcome sequence built for someone who just landed on the homepage.
4. Brand partnerships
Partnering with a complementary brand can be a genuine source of quality leads and brand awareness — but it's also the channel most likely to quietly wreck your list health if you're not selective.
Partnerships typically take one of three forms: a joint sweepstakes ("win something from each brand"), an email sent on your behalf to their database, or reciprocal social engagement. The sweepstakes format is the riskiest of the three — "win a bundle of free stuff" attracts people who want the prize, not the brand, and I've seen these lists behave more like the worst-case gamified popup than a genuine partnership audience.
Before agreeing to any partnership, vet the partner's own list health the same way you'd vet your own: ask about their engagement rates, not just their list size. A partner with 200K disengaged subscribers will do less for you than one with 20K people who actually open and click.
Why this all matters beyond the signup
Growing your list is only step one. Every interaction after signup — opens, clicks, purchases, or silence — feeds back into how your ESP and mobile carriers judge your sending reputation. A list inflated with disengaged, low-intent signups doesn't just underperform; it actively drags down where all your email lands, including your best customers.
If you're not sure whether your current signup mix is building a list or quietly diluting one, that's exactly the kind of audit I do with clients — happy to take a look at your setup and show you where the leaks are.
Hi, I'm Laura. I help DTC brands grow their email and SMS lists with quality sign-ups that actually drive engagement and conversion, through mindful customer marketing.
