Originally posted by Winder Nikon also benefits from Sigma producing a 24-70mm even if they don't make royalties. The bigger the ecosystem the more users you will attract and as good as Sigma glass is, a lot of people will eventually upgrade to native glass as they can afford.
That is so occasional amongst thousands of buyers that Nikon know it's not true, Winder.
It's why Apple used to permit clones of the Mac - more diverse hardware, like the enterprise Tower workstations - but withdrew all the licences when they realized they were making the razors but other people were selling the blades.
IBM and the PC was very much like that.
What a successful company wants is a walled garden, in an industry with high development costs but small margins like cameras, you want to make us much of the money for yourself, not as a platform for third party manufacturers.