I'd think it's because of tertiary costs like customer support, etc. It's feasible to have support staff that would listen to customer complaints for releases o

I'd think it's because of tertiary costs like customer support, etc. It's feasible to have support staff that would listen to customer complaints for releases on one uniform platform. It certainly won't be feasible to do the same for Linux releases as they and their problems will vary as much as the distro fragmentation.