It's not and that is the whole mind boggling point. I have seen p servers with ten times the amount of skins in their cash shop, lol.
How many threads on the same topic does NC need to see to know it needs to be addressed? (Props to 5s2C40D6-DN that listed out the numerous threads asking for more skins, I can't @ you because you have an invalid forum name) And how many times do players have to go unanswered before they just give up asking entirely. It's called learned helplessness, and it's the current state of your forums, NCSoft.