As an end game crafter myself whom also undercuts and ensures fair value, undercutting subject comes up usually by first time crafters getting involved in savage drop day with crafted gear. They don't understand the market won't pay 3.5 million for a i580 chest, it's not even worth 25% of that in material costs. People who are in the club know how much material costs are and what a reasonable profit is, not something like 500%