I suppose if the person needs the Gil asap I can see them undercutting, but you are really screwing everyone else and devaluing the classes. What really annoys me is when ppl post like 99 of a type of item when really nobody needs that amount. I don't undercut people because I know that's ruining the item's value; however, I will split an item into 5 quantities and sell them at the highest that they have sold before over a period of days.