Play EVE Online, people will undercut you by .01 isk (EVE's currency) when something costs 7 billion isk to buy. Imagine sitting somewhere for 8 hours constantly adjusting your price by .01 in order for it to sell in a reasonable amount of time. You think we have it bad that people undercut by 1 gil every so often? Imagine it happening every 5 min, by 10 different people.