> > Their business is selling hard drives.
> Then either they or you are confused. They make the NAS, not the drives.
No you are. You don't have to make something in order to sell it. Composing materials is a business. Selling packages is a business.
You may choose to make your own bundles at home, some don't have the time and/or skill to do so.
You're acting like this isn't normal business administration: companies push products, companies adjust offerings depending on demand. Ask Oracle how they're still in business and raking in billions.