that will be interesting. My guess is that, like emeralds, at first they will be sold for high amounts, but as they are found more, and more float around in the server, the less valuable it will become. In the first 2 weeks though, they will be a game-changer if you know how to manage it
I have 2 double chests of redstone, and went to the nether and found 9 stacks of quartz ore in 30 mins. quartz is being sold at $10 a piece at the moment, with so many people selling it but so few buying it, the chances are it will drop to around $3 a piece. But because the nether costs 20k to access perhaps it will stay at $10.