Thank you for sharing your thoughts on this pairing, Jude.
The Abyss and Liquid Gold are my current reference, chosen to be so because I think they are, quite simply, the best performing combo currently available in this hobby. I actually prefer the Sennheiser Orpheus HE90 + HEV90 in some respects, namely their grandiose rose-colored presentation which sounds larger (and prettier) than life, though that particular pairing is even MORE than this one---maybe even twice as much---if you can even find a set on the used market. Even then I still prefer the Abyss + LAu in a sense because it sounds truer to life to my ears, more like a good two-way speaker system.
I own Stax gear as well, and I am quite familiar with the Blue Hawaii SE, yet I would still take this combo over them. The SR-009 is a truly marvelous headphone in its own right, no doubt, but personally I prefer the Abyss for a number of reasons. There is no perfect headphone, even at these price points: it's less a function of "the sad state of the industry" in my opinion and more about our tastes differing. Both the SR-009 and Abyss present an incredible aural experience, they just go about it in a different way.
As for Cavalli's profit margins: there're not large. Believe it or not, Alex is making enough to stay afloat, and that's about it. The casework that people so dismissively call "DIY" is actually incredibly nice when you see it in person. There are something like 30 manufacturing steps involved in making the front panels alone, and pictures / video do not do them justice. Between the cost of all this assembly work, the quality parts used inside the amps, and the dealers wanting to be paid too, you're not looking at a lot left over.
Finally, I think it's a bit odd when folks bring up hype regarding the Abyss. Supposedly there's runaway hype for it? Er... where? Not here on head-fi, at least. In fact most of the posts about it so far have been negative and made by folks who haven't even heard it.