Currently, all the capships we've seen are (theoretically) all equally valuable. While I know some people want to change that, I think keeping them flat-priced has some advantages. For example, might it be possible (particularly in MP) to choose which class you want as your capital ship? Might add a bit of variety, particularly to the early game... (do I go for the firepower of the Kol, the early colonizing of the Akkan, etc).