I know there’s lots of confusion as to how war experience accumulation exactly works, so i decided to translate an article from cabal report (http://cabal.g-report.com/bbs/board.php?bo_table=cabal_report&wr_id=1760)
Wat is WExp?
Let’s discuss what WExp exactly is. WExp is fusion of War + Exp. As the term hints, it is experience point that is accumulated only through Nation War; therefore, only by participating in Tierra Glorissa can you earn these points. With these WExp, you can earn various of rewards.
How do I earn WExp?
All you have to do is participate in the war. You must participate in the war and have at least 10 points (there’s speculation that it will be changed to 30 points at 4/7/08) - meaning, you’re not getting jack for standing around.
*note: it’s probably 30 points, seeing that we’re well past 4/7/08
How is WExp calculated?

WExp = Tierra Glorissa Entrance Fee(20) × (Victory/Defeat Bonus) × (Nation Ratio Compensation) ×  A

According to the calculations above, you will be awarded 20 points for participating in the war and staying until the very end. Victory/Defeat bonus is determined by which nation was victorious in a way where the winners get 2 points and losers get 1. Ratio of Procyon and Capella multiplier is determined by the numbers of Procyon and Capella on the server, which is reevaluated in monthly basis, with 0.5 being the smallest and 4.0 being the biggest.

The last value, A, is different depending on how much premium stuff the person has tacked on.
For free users, A = 1
For Platinum users/blessing plus bead user, A = 1.25
For Platinum + blessing bead plus user, A =1.5

For example, if you, a normal user, lost your nation war,
20 x 1 (defeat) x 0.5 (smallest nation ratio compensation) x 1 = 10 WExp

In contrast, if you are stacking Platinum + blessing bead plus and you win,
20 x 2 (victory) x 4.0 (biggest nation ratio compensation) x 1.5 = 240 WExp

The oddball value of this calculation is the nation ratio compensation. This was implemented so that people will be attracted to the nation that is considered “weaker” by giving them more incentive. It is advised for users to convert to the side of weaker nation so that they can get more award out of the nation war every 30 days.