Loss-leader pricing sells an entry product at or below cost to acquire a customer who then generates profit on follow-on purchases — the classic “razor and blades” model, and its modern forms in printers-and-ink, consoles-and-games, and subsidized devices tied to consumables or subscriptions. As a customer-acquisition strategy it is entirely legitimate and often benefits buyers, who get a capable device cheaply. It becomes a manipulation risk when the cheap doorway leads into a costly, deliberately hard-to-leave ecosystem: proprietary refills, blocked third-party alternatives, and switching penalties that keep you paying margin long after the bargain entry.
The mechanism draws on reciprocity and foot-in-the-door — a small, easy first commitment lowers resistance to the larger ongoing spend — combined with the way people weight visible upfront costs far more heavily than diffuse future ones. The entry price is salient and low; the stream of consumable and upgrade costs is spread out, easy to discount at the moment of purchase, and only fully felt later. Lock-in mechanisms (proprietary cartridges, ecosystem-only accessories, accumulated data) then raise the cost of exit, converting a one-time buyer into a captive one.
The defense is to price the entire ownership arc, not the entry ticket. Before buying, add the upfront cost to a realistic estimate of consumables and upgrades over the product’s life, and check whether generic or third-party refills are supported. Ask what leaving the ecosystem later would forfeit, and treat that switching cost as part of the price. A cheap entry into an open, competitively-supplied ecosystem is a genuine deal; a cheap entry into a closed one where you’ll overpay for refills forever is the hook doing its job.