In a DB blog post here http://www.disruptorbeam.com/blog/entry/looking-back-at-three-world-events they said the following:
Will the AvA VP calculations be changed up to discourage farming?
Our design team and I have discussed this at length. We have been working on revamping the VP formula, and wanted to get it in for this next cycle. We ran out of time for the Valyrian cycle, but we’re looking to modify the VP formula to factor in garrison size and camp damage in the future. How to balance the changes is a large part of why this did not make it into the Valyrian Cycle - we need to carefully think about what the consequences of these changes will be. We'll be asking for feedback in Ear of the King as we get closer to release.
This will be a very important change to keep track of, as it sounds like it will completely change how VP per action is calculated. Luckily it sounds like it'll hit next Cycle (after current Valyrian Cycle) that we'll be sitting out, so we won't get screwed over mid-season.