Somewhere at Repco, a single $40,000 jackpot lost an argument. The promotion currently in market is ten $4,000 Flight Centre gift cards instead — same money, split ten ways — and whoever made that call understood something that rarely makes it into the prize conversation: the budget buys the reward, but the structure buys the belief.
Belief is the middle variable in the 3-Second Equation — Reward + Belief ÷ Friction — and in our experience at Bamboo Marketing it’s the least designed of the three. Reward has a line item and a procurement conversation. Friction gets audited every time someone counts form fields. Belief tends to be inherited from whatever the prize schedule happens to be, which is a strange way to treat the variable that decides whether the other two matter at all.
Belief is a design decision, not a by-product
For prize-based mechanics, belief is the cheapest variable in the equation to improve, because it responds to structure and framing rather than budget. The obvious pushback is that media weight and prize salience do the heavy lifting, and a belief cue on a shelf wobbler is a rounding error. We’d put it the other way around: media buys the three seconds of attention, and the belief cue is what the shopper does with them. Doubling the media budget behind a schedule nobody believes in just buys more people shrugging at it.
Take the Repco money and structure it three ways. One $40,000 prize: the headline is at its biggest, and the shopper’s odds read as lottery-shaped — someone wins this, not me. Ten $4,000 prizes: the headline shrinks, but “1 of 10” starts to sound like a raffle at a large club — imaginable. Eight hundred $50 gift cards: no headline at all, but “winners every day” territory. They’re answers to different questions — and in the briefs we see, the choice between them rarely appears as a decision at all. The schedule arrives already shaped by whatever the prize partner offered, and the campaign inherits its believability by accident.
For what it’s worth: if that brief landed at Bamboo Marketing, we’d run the ten — but not as “1 of 10”. We’d draw one $4,000 trip a week for ten weeks and make “a winner drawn every Friday” the line on the shelf wobbler. Same budget, same prizes; the weekly cadence turns an unevaluable count into an odds rhythm the shopper can feel, and it hands the retailer ten winner moments to talk about instead of one. That’s the shape of the argument this article is making — the structural decision is where the entries are won, and it costs nothing.
How many prizes should a promotion have?
The working heuristic is the Rule of Three: one prize reads as “impossible”, three reads as “possible”, and a hundred reads as “probable”. It isn’t a statement about actual odds — a single $50,000 prize and a hundred $500 prizes can sit on identical maths. It’s a statement about how prize counts feel from the entry side of the shelf, and its job in a brief is mostly to catch the single-jackpot schedule before it ships.
But the research adds a wrinkle that should stop you from treating prize count as a dial you simply turn up. A 2015 study in the Journal of the Academy of Marketing Science found that prize count suffers from low evaluability: prospective entrants can’t judge whether ten prizes is generous or stingy, because nobody carries a reference point for what a normal prize count looks like. More prizes made a sweepstake more attractive only when something made the number evaluable — a comparison, a frame, a benchmark.
That finding rewrites the Rule of Three’s fine print. The jump from one prize to three works on its own, because “three” escapes the impossibility frame unaided. Beyond that, adding prizes without adding a frame is spend without belief. “347 prizes to be won” is a number without a meaning. “A winner every day” and “1 in 4 wins” are odds a shopper can feel. Petbarn’s current Leaps and Bounds promotion — five $10,000 cash prizes — has chosen plurality but still leans on the raw count to do the persuading. Pernod Ricard’s current Chivas and The Glenlivet promotion pairs a headline trip to play St Andrews with “1 in 4 wins” on instant vouchers: that one line of copy is doing work the entire prize budget can’t do by itself.
The frame starts earlier than the copy
Mechanic choice sets belief before a single odd is disclosed. A 2022 study in the Journal of Consumer Behaviour found consumers rate their probability of winning higher in luck-based draws than in skill-based contests, at identical cost. Every Australian promo marketer knows the 25-words-or-less mechanic as a permit workaround; its less discussed cost is the belief signal. A game of skill quietly tells part of your audience that someone cleverer will win it — you’ve paid for reach and then framed a slice of it out of entering.
Risk appetite splits the audience the same way. Work from the Rotman School of Management shows risk-averse consumers prefer schedules with multiple prizes, while risk-neutral ones are drawn to winner-takes-all jackpots. That’s the Hope vs. Greed split we’ve written about before: The Gambler enters for the dopamine of the big number, The Accountant enters when winning feels plausible. A schedule built for only one of them leaves the other at the shelf.
Tiered prizing is the default. Framed tiers are not.
The structural answer — a headline prize wrapped around a layer of frequent small wins, what we call the Dopamine Sandwich — is not a Bamboo invention, and we won’t pretend otherwise. Major-plus-minor tiering has been the default architecture of FMCG promotions since McDonald’s Monopoly made it famous. If tiering were the whole answer, every tiered promotion would work.
The part that’s routinely missed is that the two layers are different kinds of asset, and only one of them gets framed. The headline prize is a creative asset — it earns the catalogue page and justifies the display to the retailer. The bottom layer is a belief asset, and per the evaluability research, a belief asset that isn’t framed doesn’t exist in the shopper’s mind. Funding a thousand minor prizes and then whispering about them in the T&Cs is the most common way we see the sandwich fail. And when it fails, the post-mortem interrogates the headline prize — was it big enough, was it the right prize — and almost never asks whether anyone standing at the shelf believed in the bottom layer, because the bottom layer never appears in the post-mortem deck at all.
What this changes in the budget conversation
Sequence, mostly. Before the conversation about whether the prize budget is big enough, have the conversation about whether the schedule is believable: does the count escape the impossibility frame, is there one line of copy that makes the odds evaluable, and does the structure give both the Gambler and the Accountant a reason to enter? There’s a real execution layer underneath — how the pool distributes across the campaign window, how instant-win odds are seeded so a “1 in 4” claim holds up all promotion long — and that’s where Trevor Services’ piece on prize pool distribution and their walkthrough of instant win mechanics pick up the story. It’s machinery worth respecting, because a belief claim that doesn’t hold up mid-campaign is worse than none.
The strategic decision, though, comes first, and it fits in two sentences. The prize budget buys the reward; only the structure and the frame around it buy the belief. Somewhere in your next promotion there’s a $40,000 argument waiting to be had — we’re happy to be in the room for it.
