@Wade Burchette Re:"if it is too expensive nobody will buy it."
The Surface Book is not remotely aimed at the general retail market - this is very high end premium kit (and at that price point it frakking well should be!). In my opinion it is aimed at, amongst others, the following:
1. CAD professionals
2. Top flight graphic artists (who might otherwise buy Wacom kit, for example)
Just two examples, there are several others that come to mind. Also let us not forget its importance to Redmond as a willy-waver for senior members of the "managerati" who want to have kit that gives them bragging rights amongst their peer group whilst getting Win 10 into as many boardrooms and senior managerial offices as possible.
In my personal opinion it is a very fine piece of kit, enterprise kit.