Warband Valorstones Discount Fix Planned for Next Week
Originally Posted by Blizzard (Blue Tracker / Official Forums)
Last week they still worked. Now it doesn’t matter which character I try I don’t get the cost reduction for valorstones. I already reported the bug and just wanted to inform people to be careful and aware of it.

We’ve identified an issue with Valorstones not being discounted across your Warband after upgrading an item on a character. This should be fixed with next week’s scheduled maintenance.