It's come to my understanding that we are going to have more options to go on more FATEs, solo, and party quests in order to get the Stones of Philosophy and Mythology. My main question is: Why can't we use the Crysta, that we can purchase with real money, to by said stones to receive the higher level gear we need?

Even if it's for a ridiculous trade, this method can still be useful to those that lack the luxury to go through hundreds of the same guests.