The OP's question about server economy impact is something I frankly can't answer. Players set the buy and sell prices in an open market. Prices asked, and another player's willingness to pay those prices are wholly controlled by players, not us. If you'd like to know why people choose to ask and pay specific prices, you may wish to ask them directly.

That said, there was a general statement about instance loot in the Update 9 known issues. it was general for a reason. As always, we attempt to mitigate attempts by players to exploit errors in the system. We try not to call out these issues (it only encourages exploiting), but sometimes when we know we'll have to make changes we do try to let you know that something is not as it should be and will be changed.


Update 9 Known Issues.
Instances

  • Certain instances are currently dropping incorrect loot. While some are overly generous, others are overly conservative. This will be addressed in a future update.