I've been testing this for 2 weeks before I decided to post it here in order to be sure it works, and guess what? It does!
What you will be doing is to complete the weekly barrens quest after the weekly reset on tuesday but having the valor cap buff.
What you need to do:
- Reach the weekly cap buff.
- Be ready to complete the Battlefield: Barrens quest (you need 150 wood, 150 oil, 150 stone and 150 meat).
- Be next to the quest giver, log out your character on monday in that place and do not move him until the reset on tuesday.
- Log in on tuesday and turn in the quest.
After the reset you will log in and your character will still be having the valor of the ancient buff and if you complete the quest you are going to recieve 300 valor points instead of 200, so you can again cap very quickly. I'm not sure if you can do it with more than 1 character but if you are able to it will be a very helpful trick to cap vp fast.
It also works with the weekly Isle of Thunder quest (Champions of the Thunder King) but it only gives you 150vp instead of 200.
I hope you like this small but helpful exploit
Ps: I tested this on a US server.
Ps2: If you change map or perform another load screen you will lose the buff so just turn in the quest as fast as you can.