Nobody is saying there should be less Corsair ships. If it isn't fair, perhaps encourage people to make more things for Corsairs too. What's wrong with the Outcasts wanting gunboats? They are the perfect ships for pirating, as are bombers.
In spite of the Outcasts having lots more options, we still see hordes of Corsair players (Many of which don't even roleplay, so that argument is tossed out the window.). Things can't be that bad.