The big printer companies such as HP, Lexmark, Brother, Samsung, Canon, Dell etc. sell the laser printers and inkjet printers to the customer at cost or even below cost. They do this as they make their money on the ink for the printers.
HP, for example, uses third party organizations to make their inkjet and toner cartridges. These organizations are mainly located in third world countries or Malaysia and China. HP DOES NOT make any of their own cartridges.
HP advertises widely to influence the consumer to believe that their HP Brand ink cartridges are better than aftermarket brands. Many aftermarket cooperative brands are just as good if not better than the OEM HP Brand Toners.You can navigate to www.123inkjets.com.au in order to avail compatible toner or ink cartridges.
On the inside of laser cartridges, there are moving parts. These moving parts also wear down. Companies that refill ink offer very low prices however their products have the greatest failure rates.
You have to think the price of the Brother Toner cartridge as well as the price of the Brother Printer Drum. I hope the printer tips above have served you in some way. The world of printers and their consumables is a bit of a mystery and I hope I cleared some of that mystery up.