Module 2: Designing an offer people actually share

Referral reward math, worked end to end

Let's do the math for a hypothetical dog groomer. Average groom: $65. Average customer comes 6 times a year, so annual customer value is $390. Currently she spends $300/month on local ads bringing in about 10 new customers — that's $30 per acquired customer. Her referral reward budget: anything under $30 per new customer improves on ads, and she should be willing to go higher because referred customers historically stay longer.

She designs a two-sided reward: the existing customer gets $15 in grooming credit for each friend who books, and the friend gets $15 off their first groom. Total cost per acquired customer: $30 — exactly her ad cost, but with a warmer lead. If the friend becomes a regular worth $390/year, that $30 bought a customer worth 13x the reward. That's the math that makes referral programs the highest-ROI channel most small businesses have.

Now the guardrails. First, cap the reward as a percentage of first-purchase value — a common rule is 10–20% of the first order for each side. Second, pay the reward only after the new customer's purchase is complete and past your refund window; otherwise people refer fake friends and collect. Third, model the worst case: if 100 customers each refer 3 friends this month, can you afford $3,000–$4,500 in rewards? If yes, you're fine — that "worst case" is 300 new customers. If the cash flow timing worries you, pay rewards as account credit (costs you margin, not cash) instead of cash.

Why two-sided rewards win

A one-sided reward ("refer a friend and YOU get $20") asks your customer to do you a favor. A two-sided reward ("you get $20, your friend gets $20") lets your customer do their friend a favor — and people share favors far more readily than they do chores. Every major successful referral program — Dropbox, Uber, PayPal's early growth — was two-sided. The psychology is simple: sharing feels generous instead of mercenary.

The split doesn't have to be equal. If your goal is maximizing new customers, weight the friend's side heavier ("your friend gets $30 off, you get $10 credit"). If your goal is rewarding loyalty, weight the referrer's side. For most businesses starting out, equal splits are the simplest to explain, and explainability matters: if a customer can't describe your program in one sentence, they won't share it. Test your description on a real customer: "Give your friends $15 off their first visit, and you get $15 credit when they come in." If they nod immediately, the offer is clear enough.

One more lever: consider a milestone bonus on top of the per-referral reward. "Refer 5 friends, get a free month" gives your best advocates a goal to chase and costs you almost nothing extra. Milestone bonuses turn casual sharers into campaigners. Just keep the milestone reachable — 3 to 5 referrals, not 25 — or it reads as unattainable and gets ignored.

Affiliate commission structures that attract promoters

Affiliates do quick mental math: "How much do I earn per hour of promotion effort?" Your commission structure has to survive that calculation. For digital products with near-100% margins, 30–50% commissions are standard — the product costs you nothing extra per sale, so generosity buys you promoters. For physical products with real costs, 10–20% is typical. For services and high-ticket offers, flat bounties ($100–$500 per closed deal) are common because percentages of large numbers feel abstract.

Tiered commissions reward your best affiliates and give everyone something to climb toward: 20% base, 30% after 25 sales, 40% after 100 sales. Tiers cost you nothing until the volume arrives, and they keep top affiliates from wandering to a competitor. Another structure worth knowing is recurring commission — common in software, where the affiliate earns a percentage every month the customer stays. Recurring commissions attract serious affiliates because one promotion keeps paying.