They sell for 20-25 because the forge is at 30 and selling at 30 would be pointless.Lowering the fixed price will only devalue it for player selling.Bad idea.
yes .whats the point of making Damarscene Ore's from the forges now ?
The amount of damascenes that you can get from the forges is limited only on how much EC you personally have while the cheaper ones depend on the availability of it in the market. Unfortunately, I don't see many people selling large quantities at once and some people require a lot of damascenes for their recasts.
Buying from players is also more work than crafting at a forge. This extra work has to be covered by the ores being cheaper. As a side effect the (almost) unlimitted demand for damascene ores is also what's keeping supply tokens valuable. (I think.)