The customers should negotiate and declare the terms with the crafters before any trades.
I always offer 3 prices and explain the risk of each of them:
1. one-time crafting, ur mats, HQ/NQ on ur own risk, fee:xxxx
2. crafting as many as u want with ur mats until u get an HQ, fee:xxxx
3. guarantee HQ, risk on me, fee:xxxx
"too bad" if they NQ your stuff
This sounds familiar when a starbuck/fast food boy messed up my order, dude, you have one job, no wonder u are earning pennies, do your fxxking job. Or someone died in titan and type "sry guys, lag", yeah keep telling urself that.