The other day I was helping a guildie with their mage as they reached 20. Thus began the long journey to collect teleportation training from around Azeroth. Something he said along the way stuck with me though. He mentioned that he hardly sees people asking for portals to Darnassus now. I thought about it, and would have to agree. I seem to sell as many ports to Darnassus as I sell to the Exodar. The cities are so closely linked, it's fairly easy to hop on a boat and be anywhere on Kalimdor that you need to be.
Why then the great level difference in the training? The portal to Darnassus still remains a spell you can train in at level 50, while the portal to the Exodar is a level 40 spell. This goes for the teleport spells as well, since the level for Darnassus is 30, while all the others are available at level 20. So in essence, all that bouncing around the continent starts ten levels sooner. I imagine that initially the portal to Darnassus was level 50 because it represents a greater magical achievement. You are now transporting a group across the ocean. Does the Exodar require less skill to use? You are still transporting people across the Great Sea. Wouldn't it in fact require more skill, seeing as how we have had a longer history with the Night Elves than we have with the Draenei? I am thinking that the developers might want to take a look at the level requirements for the portals. The initial level requirements seemed to support the lore. The training, as it stands currently, does not.
A possible explanation is that Night Elves shun arcane magic. However, they do accept the portal trainer within their city, so this argument doesn't seem to work for me. If they let that first mage in there to create the portals in the first place, why would it be more difficult for other mages to do so? Is there some sort of other explanation that I'm missing as to why there is such a level discrepancy with both the teleport and the portal spells to Darnassus?