Like everyone else said, augments are useless and this creates little demand for it. Low demand means low prices.

Yes the selling price does change, and I don't think it is tied to vendor prices. I sell some greens that I loot while questing and some are going up for 4k plus for level 39, when I know the vendor price isn't more than a thousand. I just think prices would more reflect supply and demand if Bioware took out the auto-pricing feature when you go to sell items. I noticed that many relics, augments and other items are going up for really cheap, probably has to do with people just dumping product on the market using the auto-pricing feature in the game.

I'm sure I'm not the only one who thinks this but I feel as though the GTN is clunky, slow to use and not as good as it should be. I have a few gripes with GTN: -Not being able to shift+click items into the search function to allow for more precise searches. -Having to click through the categories and sub categories, and having to do this just to search for specific items. -When you go to sell an item and you drag the item into the sell window, the GTN gives you a recommended price for the item. I don't really understand how the GTN calculates the price, does it undercut the cheapest item currently on the market, or does it give you a price based on the averages of the current items on the market? I feel that many people base their prices solely on this give GTN, which may not reflect actual prices based on demand. I can't think of much more off the top of my head, but there are a few issues I have with the GTN and hopefully Bioware can expand and revamp the GTN in future patches.