The rarity score represents the availabily, or the offer for a game. This is mostly determined by the number of copies produced by the publisher. The rarity can be altered over time when some games become popular and people hold on to thier cartridges instead of selling them. This could be the case with games such as Ogre Battle of E.V.O. The numbers themselves come from Jason Fleck's list and Digital Press. Both these sources were comiled and compared then tested against eBay to ensure the most accurate data possible. Highest numbers are rarer, as the following table shows :
How much hype does this game has. This is equivalent to demand. The more a game is known and sought after, the more hype it has. The term hype is used here because some games are very expensive and sought after even if they are not that great. Perhaps you wouldn't want to pay $ 80 for Harvest Moon, but enough people do and you're gonna have to pay the price to get a hand on it.
Quality of the game juded by me. Games I never played are obviously not rated. The considered aspects are :
This value (in Canadian Dollars) is determined by an algorythm using hype and rarity. It represents a good price to buy a game for resale.