I'm just going to throw my 2 cents in here, in regards to a few things talked about here.
Firstly, in the creation of a price guide, what factors are you taking into place and where are the numbers coming from? Are we just going buy the average price you see on shops, are current stock and of these shops taken into consideration? I kinda look at this differently a bit, blaze rods for example, you have up there 1-2 dcd, but is that realistic to what people actually would pay for them? I'm looking at this from the view of what people, not all, are willing to spend. Yea blaze rods sell at 1-2 dcd all day, but I've sold and purchased recently chests of blaze rods for 4-6 dcd a piece. That's just an example.
As for server shops for selling items to and buy items from outside the Golden shovel shops we currently provide, I'm in no way for adding any sort of shop. I'm not a fan of bringing items or currency into the game that shouldn't exist in the world. There's far more than enough players to acquire and provide resources someone may need, and the existence existence of server shops would ultimately put a set value onto things, and in a way remove a bit of the need for playing the actual game. Maybe a bit extreme statements on my part, but still partly facts. If players constantly buy from the server, no dcd would flow between players, making purchases from the server site shop more impossible to acquire that they already are in the "I sell it cheaper than you" market that's been created on here already.