You're missing the point. Nothing in this game should cost only 10k to create. There should not be 50 raw gems for every player on your server. The supply is too high and that's why the prices are so low. I reiterate, prices are coming down quickly because the supply of materials is way higher than demand. This is basic economics. When supply is higher than demand prices fall. When supply is way higher than demand prices hit rock bottom. That's exactly what is happening. To stop this you have to get the supply balanced with the demand. To do this you make items rarer. This is the basis of a stable economy.
If your thread isn't about improving the game's economy then don't title the thread as such.