I think the purpose of having it split by level is to help lower level player make gold. Remember lower level player will need to buy runes to. So yes twinks don't need to buy anything but other players making there way through the game will be able to farm runes and sell them. Obviously I'm guessing. Maybe they did it to help twinks. I've seen a ton of posts where they complain that everything new is based on end game content. I could see sts giving them something to be happy about. For the rest of us we will be selling and trading for the type we need. Similar to the light bearer and adept concept where you can only craft half the items. It encourages people to work together or trade for what they need.