Quote Originally Posted by saike View Post
it's asking for crystals and the karma I have already though when try to trade
Got the crystals for Platinum, tried it. The message says
Trade "150 crystals" and "Karma"
though it should actually say "for" instead of "and". Message is the same for the other crystal units as well, so it takes 150 crystals and gives you Karma, it doesn't take 150 crystals and Karma.
Buy your plat Karma at your convenience.