Originally Posted by KTS1010
You don't have to buy one of these lines you can just customize one of your own.
True, but I'll bet that certain combinations will be exclusive to the lines and not available ad hoc. Also, certain combinations won't be possible (such as brown leather with a red dash accent strip).
Also, in some regions, there will probably be only limited options available if you choose not to order one of the lines. For example, you may just get black or gray leather with no contrast stitching, and the choice between one type of wood or aluminum for the trim.