You have horribly bad luck then I have got and sold the Nihilus mask and Revan Mask and sold them for 2/2.5 million on the GTN. I have also sold several Blue-Cyan crystals for 200k-250k each.
I am serious. My rarest items were the new colour crystals, endurance ones... Once I got a set of both Revan's armor and robes but that was post the hype and high-prices. :l