Generally speaking every ten loot is worth around 100 gralats. Since talk like a pirate day has happened each year for the past three or so years, alot of people will be saving their loot items for that exact day. Now if you have 100 people all selling 200 loots for about 2000 gralats, thats money you wouldnt be able to usually get any other day. Its creating gralats from nothing - which is a simple explanation of how inflation works, because when there is more money in the economy, the items which are sold in shops will go up in price. Its why items cost so much nowadays, because there are alot more players with fat stacks of gralats.