The huge increase in the actual and expected income at higher levels is kind of a strange design. So this makes it hard to set the correct price for static vendor mats like the morphing things, since the resulting item could be worth 1000 or 5000 depending on inflation at higher levels. If we ever go back to the abyss and find out where to learn morphing recipes, that easily gives a profit even on simple things like Aether. The important thing is how much aion kinah about improving the game.
As of now there are only 2 such endgame instances, but it is a relatively new game, and theres always time, and room, for improvement. NCsoft doesnt publish the exact numbers. They closely monitor balance to ensure theres never more than 3% aion gold, however you have to keep in mind that some players may be inactive, banned, or fiercely casual, and still count on those numbers. The armor choices of the Assassin are very minimal; they can choose between Cloth or Leather. Cloth will not be suited well for them, as the defense is much lower than with Leather armor. Their weapon choices are daggers or swords (or one of each), or bows.