The warranty can be worth more to the seller than the device is

A $15 add-on is an easy sale to overlook: beside the price of a new gadget, it feels small. But extended warranties can bring retailers a much larger profit margin than the electronics themselves. The store may earn money from the plan directly or receive a share from the company that administers it. A cashier may also be judged on how often customers accept add-ons, or may earn a sales incentive. Those pressures can make the offer sound more urgent than the device’s price warrants.

The seller is betting that claims will cost less than sales

A protection plan pools many buyers’ payments to cover a smaller number of repairs or replacements. The seller or plan provider collects money from everyone, while only some customers make eligible claims. The business can profit if the total collected exceeds the cost of claims, administration, and payments to partners. For an inexpensive device, even a modest repair bill can exceed the purchase price—one reason the offer may seem attractive to a customer, too.

Check what the plan actually adds

The key question is not simply whether the device might break, but whether the plan covers a likely problem that you could not handle another way. The manufacturer may already provide a limited warranty, and some payment cards offer separate purchase protections. Extended plans can also have exclusions, claim procedures, or deductibles that reduce their practical value.

Before saying yes, ask what failures are covered, when coverage begins, and whether a repair, replacement, or refund is promised. The cashier’s insistence reflects the economics of selling the plan—not proof that this particular device is likely to fail.