As i just won rolls on Nether Vortexes, so i can make that belt for my self, you realize that you lose other loot for using dkp on Vortexes.

If your going to sell that belt, it's going to be expensive. Cause no1 will realy farm vortexes for sale of armors yet. maybe in a few months you can see belts like 'Belt of Natural Power' on AH for like 2k gold, but for now the price that you came up with is imo cheap.