As with most buyers though, Venson and a fair point that Mole raises here, most buyers don't know the model number or care to know more about the model they own. Whilst it's not entirely a same example, when looking for remote control batteries for TV, my LG manual cites "always buy Duracell," but I currently have heavy duty JVC ones in mine that do the same job and half the cost. I hear what you're saying about buying Genuine accessories and consumables though; there are quite a few imitation copy parts I've used that haven't faired so well, but you take a chance in the same way you take a chance with something inferior or cheaper at cost.
Sometimes manufacturers recommend other brand products to be used in concert with their own. Usually stemming from a business venture or relationship that they may have in common. Or management execs who worked at both and keep the professional ties binding.
Carmine D.