Well i just think that yes, selling fighters etc may be ok, it is done atm true. But i personally think that a state of the art battleship, example already given here of the outcast dessie, would not be sold to others. I don't know, i just seem to think that to RP the roles that each faction has, they should abide by the ship lists given. Maybe with an exception to the Order, as i know that they are very thin on the ground in their own ship choice.
IMO some of the factions have not been given huge capships to fit in with their rp, and they should adapt and use tactics to solve this. Looking at the Xenos, we have no capital ships, yet we make do with our bombers and fighters. And play the role very well.