I for one am more than happy to pay for more ship skins to add further diversity to large games and think that whatever PDX spend on creating new skins they will easily make back.
What i would love to see even more though are some ship options that don't follow the existing corvette, destroyer, cruiser, battleship tree, i find it hard to believe that every single race in the galaxy would create these same ship types and fleet structure, we should see options for hive fleets for example which would consist of just carrier ships of different sizes that unleash swarms of fighters. I'm sure the dev team and community could easily come up with more ideas on this and i think it would add not only an extra layer of realism(sci-fi realism....) to the game but also an extra level of strategic/tactical depth and variety.