The advantage of different options is that people can choose where to get their own replacement ink cartridge or replacement toner instead that only from the printer manufacturer.   In this case we are talking about Epson. 

There are OEM Epson cartridges, remanufactured, and compatible ink cartridges and replacement toners. When you're purchasing an OEM or original equipment manufacturer, you're getting a cartridge from the manufacturer in its original condition. A remanufactured replacement ink or toner cartridge is a used cartridge that has endured repackaging and has been refilled with ink. A new compatible ink or toner cartridge is one that completely new and is similar to the originally manufactured product but doesn’t have its brand name.