For the moment, the advantage of Hypex over Purifi is pricing power. Something tells me that this will not change anytime soon and that is making a huge difference when talking to the big boys.I mean it's kind of sink or swim time for them isn't it? Purifi is rapidly diversifying from not just a SOTA amp module but also SOTA speakers, and developing a SMPS should be fairly trivial for them so...
If they bought IP from Purifi they might be able to poke around and learn some things, but they wouldn't be able to use them (if the 'cleanroom reverse engineering' I read on here earlier was right). And having a few hints here and there isn't as advantageous as understanding the whole thing. So they have to make a go for it on their own, learn what they can along the way, and see if they can understand the whole well enough to beat Purifi (or at least remain competitive).
The Purifi IP I was talking about is the ability to have a complete mathematical model of the amplifier. This allows to be less conservative on the feedback loop parameters ensuring the ultra high performance we all know about while running extremely cold.
Hypex do not have this ability, the math they use has been published by Bruno P. long time ago.