Somewhere in a planning meeting right now, a brand team is arguing about whether a cashback should be $5 or $10. The $5 version protects the budget. The $10 version feels generous. What rarely gets said out loud is the question that actually decides whether the promotion works: at what point does the reward become too small for anyone to bother claiming it?
That tipping point has a name. In The Shelf Truth we call it the insult threshold, and it quietly kills more promotions than bad creative ever will. A promotion can be perfectly compliant, beautifully designed, and properly funded, and still fail because the reward on offer wasn’t worth the effort of putting your hand up for it.
What is the insult threshold?
The insult threshold is the point at which a promotional reward is too small to justify the effort of claiming it, so the customer decides it isn’t worth doing. Below that line, a shopper does a quick mental sum — what they get versus what they have to do to get it — and walks away. The offer hasn’t just underperformed; it has mildly annoyed the person it was meant to attract.
This is the same shopper maths behind what we call the 3-Second Equation: reward plus belief, divided by friction. A reward that sits below the insult threshold drags the whole equation down no matter how strong the rest of the campaign is. You can have a believable prize and a famous brand, and still lose people at the point where the number on the offer is too small to move them.
Why small rewards quietly fail
The evidence from rebates is hard to argue with, because rebates make people do real work to collect real money. When the payoff is between $10 and $30, redemption tends to sit in the range of 10 to 30 percent, and falls below 10 percent for smaller dollar amounts. The pattern is consistent: the smaller the reward, the fewer people claim it, even though claiming is the entire point of the exercise.
It isn’t only that people forget. When Leflein Associates asked consumers why they missed out on rebates, 41 percent admitted they simply forgot and 25 percent lost the paperwork, but 20 percent made a deliberate decision that the reward wasn’t worth the effort. That last group is the insult threshold in plain sight. One in five people looked at the offer, did the calculation, and chose not to bother. They weren’t careless. They were rational.
This is also why participation rates are so wide. Consumer Affairs has noted that rebate take-up generally ranges anywhere from 5 percent to 80 percent depending on the value of the rebate. Value is the variable doing most of the work. Get it right and most eligible buyers claim; get it wrong and you’ve printed a discount almost nobody collects.
It’s not the dollar amount on its own — it’s the effort sitting next to it
The insult threshold isn’t a fixed number you can look up. A $5 reward can feel generous on a $15 purchase and insulting on a $1,500 one. The reward is always judged in proportion to two things: the price of what the customer bought, and the effort required to claim.
That second part is where promotions lose people without anyone noticing. Every extra step in a claim — another form field, a receipt photo that has to be retaken, a code typed in from a curling docket — is friction, and friction is a cost paid in lost claims. We call this friction as a cost for a reason: it compounds. A reward that would have cleared the insult threshold with a two-tap claim can fall below it once you bolt on registration, receipt upload, and a survey. You haven’t changed the dollar figure, but you’ve raised the price of collecting it, and the customer’s mental sum tips the other way.
This is the trade-off worth sitting with. Brands often try to protect a reward budget by shrinking the reward, when the cheaper fix is usually shrinking the effort. A slightly smaller prize that’s genuinely easy to claim will often beat a larger one buried behind a clumsy process. In the cashback campaigns Trevor Services has run, the programs that perform are almost always the ones where validation and payout are quick and the customer can see exactly what they’ll get and when.
How much should a promotional reward be worth?
There’s no universal figure, but there is a usable test. A reward clears the insult threshold when it is large enough that a reasonable person, looking at the effort involved, would say “yes, worth it” without hesitating. If you have to talk yourself into it, your customer won’t.
In practice that means sizing the reward against the purchase, not against your budget line. A cashback worth a meaningful share of the item’s price reads as real money. The same dollar amount on a much pricier product reads as a rounding error and gets ignored. It also means being honest about category norms. Australian shoppers are more deal-aware than ever under cost-of-living pressure, and they sit inside a mature cashback ecosystem — Cashrewards, ShopBack and others have trained people on what a serious offer looks like. A brand-direct promotion is being judged against that backdrop, not in isolation.
Prize draws play by a different rule, because there the reward is a chance rather than a certainty. A single enormous prize can still feel out of reach, which is why the Rule of Three matters: one winner reads as “impossible,” a few winners as “possible,” and many small wins as “probable.” The insult threshold there isn’t about the dollar value of one prize but about whether entering feels like it could plausibly pay off. Certainty rewards like cashback are judged on size; chance rewards are judged on believability. Most weak promotions confuse the two.
The thinking behind all of this is what Trudy, Trevor’s predictive promotional intelligence platform, is built to pressure-test — looking across thousands of past promotions to flag when a reward is likely sitting under the line before the campaign goes live, rather than after the redemption numbers come in disappointing.
The test worth running before you launch
Before a promotion goes out, it’s worth doing the customer’s sum yourself. Look at the reward, look honestly at everything you’re asking the customer to do to claim it, and ask whether the first genuinely outweighs the second. If the answer is “only just,” you’re near the line. If you’re trimming the reward to protect the budget, check whether trimming the friction would protect it more cheaply — slippage from forgotten claims already does some of that work for you, and you don’t need to insult anyone to capture it.
The brands that get this right tend not to be the most generous. They’re the ones who understood that a reward is only worth what it’s worth after you subtract the effort of getting it. If you’re rethinking how you size rewards across your promotions, we’d be happy to talk it through.
