If you buy a new printer every time you run low on ink, you’re basically arbitraging that CAC line item. On paper it can be a “life hack” as long as only a few people do it and you ignore the e-waste and friction. If it ever became common, the easy knobs for the manufacturer are obvious: even smaller starter carts, more lock-in, more activation hoops, and less of the subsidy that makes this trick work in the first place.