There is a lot of reasons, but the more basic/simple answer to start is because we dont need a new extension..
We have thousands of .com domains, few .net/.org. No point to support new .xxx and spend on that...
Plus the price were too expensive, much more than regular extension we buy...plus they've tried to get huge price on some good domains...
Also the facts that it woukd be easyer to block .xxx for a country,office, etc...
From the beginning they started it wrong and scammy and us like most of companies decided to boycott them..
And still seems the right decision, except few domains,most will not pay the annual fees with the earnings..
They were no hype and it may die by itself or stay like a .info or other kind of ext..
Thats my personal opinion..
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