Skip potions already exist and they cost money because it deters new players from throwing away all the content that has accumulated over the years. The devs probably don't want players to run out of things to do, to not be able to enjoy the newest story or to miss out on the free Fantasia and then complain on the forums. Encouraging a friend to rush to endgame instead of utilizing level sync to play together is a disservice to them, and the cost of the story skip is there to indicate that it's a bad idea in case the new player lacks foresight.

Quote Originally Posted by JohnSpawnVFX View Post
no one's starting over just for the dialog and fetch quests
Yeah, some people do that. I leveled an alt just to redo the DRK quests and want to see the Haurchefant story again. I'm considering redoing the whole story with NG+ as a Hrothgar if I use a Fantasia and only getting solo duties would be incredibly disappointing.