Because SE want you to level up mages classes to get the melee traits
And level up the Melee classes to get the mages traits
All melee jobs get the +10INT/MND/PTY and +5INT/MND/PTY traits
All Mages jobs get the +10STR/DEX/VIT and +5STR/DEX/VIT traits
It's there way to force you to play more than 1 class (and not only 2 melee or 2 mages but you are forced to play 1 melee and 1 mage if you want these good traits) at lv+30 each state take 4points to increase so 15Vit is equal to 60 points
Crapy system by a crapy game.
Edited, Oct 23rd 2010 11:01am by SephNex
If you are playing DoM as main, you prolly wont put points in melee stat. Somehow when you decided to play DoW, you can purchase those traits and convert some of your bonus to melee stats.
Since those traits only affect the bonus, which means, for example, if you haven't put any point into str, a -str10 bouns +int 10 bonus trait wont do anything.
Also, each stat cost 1 bonus point below 40, 2 bonus point between 40-60..etc, there's nothing to do with your level.
Crapy comment by a crapy player.