I think after the tenth level of contract offering a secondary skin there should be 5 more that lead to a main weapon skin. Of course xp required would be absurd but still. Maybe another 5 for a knife.

You can literally right click the knife right on someone's fucking head and it will just phase right through them. I've never played a video game with a more bizarre hitbox than the knife's right click. Landing it require some kind of arc...