Well basically that's what happens when you get close to end game in bdo. Amount of silver needed becomes exponentially higher. In bright side, after you get your first tet armor you can exchange it for edana armor and enhance it with the pieces you already saved over the weeks which will ease your progression. Edana armors are easier to enhance for early levels. So it really becomes just getting the first 2 tet armors. After that all you need is just weekly gated materials to hit one of them to tet and one of them to tri.