Whether you are Asmodian or Elysian, there is one thing you will always be in need of to make it anywhere in this game; Kinah. Just as in real life there are several ways to make a living. This Aion guilds will give you some ideas. Some of them take more time and skill than others, but for the imaginative player there are loads of options for making bundles of Kinah.
Here is a list of possible ways to provide a service to other players and make a profit from it:

1) Aquire low-value Manastones and upgrade them

By use of Alchemy you can turn low grade Manastones into higher grade ones that are more sought after. For example, buying stones that are both impopular and low grade and then turning them into high grade sought after ones using the Manastone Exchange Quests.At the time of writing, the most popular stones are the Attack stones and Critical Hit stones, as well as Magic Boost and Accuracy

2) Making consumables using Cooking or Alchemy
Because players of all classes need them they are always in high demand. What items you choose to specialize in will depend on two things: The first thing is supply vs. demand. If there are already a lot of players making a certain item, you might not be able so sell as much of it. Also, unless you can get the materials needed for the creation of the item at a lower price than what you sell for, it is obviously not going to be profitable.

3) Buying when the tax is low

Not exactly a service, but a profitable strategy for any salesman. Be smart and purchase any of the materials you need when the tax is low, and sell when it is high

4) Making sought after equipment in low supply

If you keep your eyes and ears open about what players are eagerly looking for, and compare the numbers wanting it with the number of players selling it; you have just found yourself another source of income.

5) Buying lots and selling few for a profit

Certain items are required for quest completion, and then only in small numbers. A lot of players sell huge amounts of items at a time for a bulk price. A player only looking to complete a quest might find it unattractive to buy that many when he or she only needs a few. What you do is, you buy in big quantities, but you sell them piece by piece for a profit. Lets say you bought 100x of something for 100.000 kinah. That is 1000 kinah a piece is now you go and sell that item for 2000 or maybe even 3000 depending on your competition. Kinah in the bank!

6) Selling equipment that look like better ones

By going to the Abyss and gaining AP, you can then aquire parts of the Green Holyspirit and Evilspirit gear. Now you are wondering.. so what? Well, their skins happen to look exactly like the strongest level 50 Abyss Gear. And if you exchange skins with other gear, you can then sell that equipment for a higher price. The value for the buyer being that other players might not want to risk attacking him because it looks like here is got better gear than he actually does

7) Making more characters for a bigger profit

If you create several characters in the same faction, get them up to level 10 and able to use the Broker, that means you are able to put up more items for auction (10 items per character), and move them around between each other as well. By doing this you accomplish two things; faster income and more inventory storage space. Win, Win!

8 ) Gathering and selling Aether or other needed items

Because Aether is required for producing other things, there is always someone out there who wants to buy it. Yes, everyone can gather it themselves, but not everyone has the time or energy to do so. That is  where you come in, providing a service. Besides Aether, you can also sell jewels, herbs, and other items used for different types of Crafting. Which ones will have to depend on supply and demand. That is something you will be always need to think about no matter what you are selling