Just a thought: if I were a decision-maker at O'Reilly, there's no way I'd allow my brand to get diluted by Packt with these oreilly.com joint publications. Reputation is everything (or almost everything) in the publishing world, and it's why when you see O'Reilly's name on the spine, or Wiley, Addison-Wesley, Manning, or No Starch, you can expect a certain quality.