Following on from the changes made to DP before, there are a few new changes in play.
The shop will no longer allow you to sell items to it, and eventually the sell button and balance of the shop will be completely removed. Instead of selling all rubbish/unwanted items that you obtain, the next stage (not yet in) will allow you to use items to restore other items, allowing you to keep an item you want around while throwing the others at it to keep it alive.
Now that you can no longer obtain DP via selling items to the Shop, the shift of where the DP comes from has changed. Now, whenever you buy something from the system (Item Life Refill, Shop Item, Experience Bar Refill, Upgrade) the DP will be equally spread among the three Activity Banks: PvE, Zombies and PvP. There’s no way yet to see how much each DP each activity currently has, but it will probably be obvious if you are simply gaining DP alongside XP.
The next stage
The next stage is to re-introduce the Experience Efficiency Bar with its upgrades, all costing DP. The point is to allow people to level up faster with the larger experience requirements of higher levels and to try and increase the flow of DP between users and the system, because as the flow of DP increases, the amount of DP in the flow will increase.