there was a large incident not to long ago that DESTROYED the EMC shops and economy - it had to do with some dupers giving a LOT of diamonds to a player for free and selling them for a large profit to multiple players. We're talking double chests on top of double chests FULL of diamonds. It was a mess.
i concur. i think the vault runs great as is. but having it in the wild would be stupid. and so would be putting a limit on the number of enderchests you can have. it shouldn't even matter unless you have x ray and mine a LOT and get valuables quite often.
It's not x-raying minerals, but perhaps getting a lot of sand, cobble, or dirt. It would be a nice perk for people willing to pay a high price, like being a supporter, but without having to pay real money.
sand cobble and dirt aren't as valuable as minerals, so it wouldnt really effect any market really - considering none of it is really in demand, except sand. sometimes.