Why would Xerox not try to market a computer more advanced than technology that we would not see until almost a decade after it was introduced in 1973? Obviously I know some factors played a role in this, such as cost and what not, but with such a unique system and one of the first GUI made you would think Xerox would realize the future of computers as we know it lay directly in their palms.
The design itself seems to be made for use in any general work/home enviroment, for instance the portrait orientation of the screen, giving you a perfect display of whatever you may be printing to the dimensions of printer paper. A well made file manager, a interface made easy for any non-tech savy users, and it even had games such as MazeWar, a vector based first person shooter very neat for its time!
So why would Xerox put money into the development of such a unique computer that seemed perfectly made for use by the general public at a time when nothing else similar even existed if they had no intention of marketing this in the first place? Why design something for such a wide range of computer users? Why invest in this computer at all? The cost was estimated to be around $40,000 (if sold) which is indeed steep, but I imagine had they sold these, that many universities and businesses would have invested in a product like this.