Seeing as this is a mastery ideas thread I thought I'd throw in a thought I had today.
Upon passing 1,771 mastery, the no more commons on mastered BPs magic number (I think, it's somewhere around there), mastered BPs at Common can now be automatically used in upgraded crafting slots if a Good version is required.
Sacred Tunic masters at Common.
High enough mastery means you will never craft at less than Good quality.
Gold Stitch requires a Good Sacred Tunic.
Allow Gold Stitches to be crafted without needing a Good Sacred Tunic in stock.
It's another plus to the upgraded version crafting slot.