Out of all the registered Steam accounts in the world, only 10%, or about 73 million in
SteamIDFinder’s database, are public. Based on data from those accounts, we calculate that collectively there’s around $1.9 billion / £1.4 billion worth of games that have been purchased and then never played even a single time. Times that by ten, to roughly account for all the Steam profiles that are not public, and you arrive at $19 billion, more than the gross national product of Nicaragua, Niger, Chad, or Mauritius.