Particularly true for dedicated black-and-white [grayscale] cameras. Despite the basic premise being so simple - the use of a monochrome sensor rather than a color sensor - the models available on the market are all horribly expensive, whereas the regular, colored cameras start at throwaway prices. It isn't like monochrome sensors are costly - several Huawei / Honor smartphones over the years have incorporated a monochrome sensor as part of the multi-camera setup. The real reason seems to be companies' desire to milk people as much as they can. Same with dedicated air-purifiers. Regular ACs installed in homes already have almost all the components that comprise an air-purifier - motors, casing / housing, control board, wiring, fans, etc. The only thing that needs adding is fortification of the dust filter inbuilt into the air conditioners. The basic point here is that at least for some products, prices are unnecessarily high, when the core feature / functionality of those products can be implemented for a much cheaper price.
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