He He.. That is funny. There some ways to make adena..
1. Make your own crafter(usefull in servers both rates... low= make own shots / high=make weapons and armors)
2. Spoiler. (Spoil mats/key mats/enchants/recipes)(usefull too in both rates Low=Mats,recipes,key mats / high=enchants to try make overenchant)
3.Make a support char. (WC,SE,EE,PP,BD,SWS) usefull to sell buffs and if possible, you can exp more faster making dual box.
4. Manor system. Manor system is very usefull to get mats.. a lot mats. You can sell, or try craft something.
5. Be a lord of a castle to take tax from town -.-".
That is. I think I fogot something, but it is just to you have a idea.