This question might belong in the "Bewares and Background Check" thread, but a quick perusal of the website comes up with this:
The way we "share the risk" is by asking the author to purchase a pre-determined number of books for his/her own distribution at a discount off the retail price. The discounted price we offer, while substantially less than the retail price of the book, is more than just the cost of printing. It helps to cover all of the other costs including editing, cover design, pre-press typesetting, STL catalogue placement, and overhead. The more books the author orders, the bigger the discount he/she receives. In this partnership arrangement, we ask the author to order a minimum of 1000 copies or more at the time of the original printing to help defray the costs of publishing the book.
It's vanity publishing by a different name.