Very important for certain customers:
RH has a Common Criteria certificate. So, it's basically the ONLY Linux you can run in an IA environment. The other option is Windows. I don't even know if Solaris is there, still. I've seen customers migrate entire Ubuntu networks to Red Hat, to meet this set of requirements.
This means revenue for Red Hat, and this drives them to work towards being a one-stop-shop for IA Enterprise systems.
With other environments leaning towards HIPPA and other sets of security regulations, the fact that Canonical doesn't really play in this space means that Red Hat is pushing in this direction.