A bundle presents several items at one price and invites a comparison against buying each separately. That comparison is constructed carefully, and it usually favours the seller.
The reference price is chosen, not discovered
Every bundle implies a total for the components bought individually. That total is drawn from list prices, which are the prices at which very few of the accessories actually sell.
An accessory that routinely trades well below list still enters the calculation at list. The stated saving grows without the seller giving up anything real.
The mechanism works because shoppers verify the main product's price carefully and rarely check the accessories at all.
Accessories carry the margin
Cases, cables, memory cards and mounts are inexpensive to produce relative to what they retail for. Their margins are far wider than those on the device they accompany.
Adding a high-margin item to a low-margin device raises the profit on the transaction even when the bundle price sits below the sum of the parts.
This is why bundles cluster around cameras, consoles and phones, where the hardware itself is sold thinly and the ecosystem around it is not.
Bundling protects the headline price
Manufacturers resist cutting the advertised price of a flagship product because the number anchors the entire range and is difficult to raise again afterwards.
Adding an accessory delivers extra value to the buyer without touching that number. The product still lists at the same figure in every comparison a shopper might run.
Bundles therefore appear most often at moments when a price cut would otherwise be expected, such as late in a product's life or against a competitor's launch.
Unwanted extras have a negative value
An accessory you would not have bought is not worth its share of the bundle price. If it sits unused in a drawer, its contribution to the transaction is zero.
Worse, a bundle can crowd out a better standalone choice, since the included item discourages buying the alternative you actually wanted.
The honest test is whether you would have purchased each component at its market price on its own. Anything that fails that test should be valued at nothing.
Comparing bundles against each other
Because bundle contents vary between retailers, the same device can appear at several effective prices on the same day depending on what is packed alongside it.
Stripping the comparison back to the device alone, then treating extras as a tiebreaker, produces a cleaner ranking than any advertised total saving.
Sellers who bundle generously are frequently signalling that the device is not moving, which is useful information about where the price is heading next.