Also of interest is that their business plan included two significant differences from a traditional house: 1) no author advances, only higher royalties, and 2) no print books, only ebooks (they planned to add POD later). Even these innovative ideas weren't enough to overcome the high cost of starting a business— and possibly the difficulties of operating in the current economy.
Well, if they had signed any new authors who thought they were going to break into publishing with Quartet, my heart goes out to them. In this case, it's no longer a business.