[22:28]:Ulath <bat>: Instant pop-quiz!
[22:28]:Ulath <bat>: Nearest guess wins.
[22:28]:Ulath <bat>: How much gold has been spent on Esiris portals, since
ever?
[22:28]:Elwynes (bat): 0
[22:28]:Sumendar [bat]: 120M
[22:28]:Lozlo [bat]: 8.2m
[22:28]:Farliss (bat): 22m
[22:28]:Bogle [bat]: 42M
[22:28]:Delveling (bat): 500m
[22:28]:Ishmael [bat]: 15m
[22:28]:Hair (bat): 275M
[22:28]:Garok {bat}: 17M
[22:28]:Antarax {bat}: 4.5m
[22:29]:Darkahven (bat): 358m
[22:29]:Ulath <bat>: I'm giving you 1 minute more
[22:29]:Akiriuma [bat]: 400m
[22:29]:Ulath <bat>: To guess, that is!
[22:29]:Ikazumi [bat]: 300m
[22:29]:Neclord (bat): 10m
[22:29]:Jacen (bat): 726m
[22:29]:Suikale (bat): 32.58m
[22:29]:Shimmer [bat]: 55m
[22:29]:Anti (bat): 15m
[22:29]:Deathgazer (bat): 35m
[22:29]:Inferno (bat): 345m
[22:29]:Garok {bat}: 35.001M :)
[22:29]:Lyriikka (bat): 87m
[22:29]:Tribune (bat): 69M
[22:29]:Taucci [bat]: 1.1g
[22:29]:Val (bat): 30m
[22:29]:Aga (bat): 354m
[22:29]:Xortoth {bat}: 700m!
[22:29]:Chack [bat]: 39.99m
[22:29]:Shedevil [bat]: 495m
[22:29]:Riistis (bat): 420m
[22:29]:Darkahven (bat): 1300m
[22:29]:Rurack [bat]: 12,432m
[22:29]:Nepos [bat]: 24m
[22:29]:Bleezuz (bat): 1.2G
[22:29]:Deathseeker {bat}: 647m
[22:30]:Ulath <bat>: And... Done, no more guesses
[22:30]:Sumendar [bat]: nice ambiguity there rurack
[22:30]:Slimeburger [bat]: 0
[22:30]:(bat): Delveling slathers in anticpation
[22:30]:Ulath <bat>: Using my archwizardly keen senses, the right answer being
258,070,400... I would say.. Hair is closests!

If you count the average from those guesses, you get 279,8m. Furthermore you
get 272m if you include Slimeburgers guess which came after Ulath declared
done and that is actually closer than Hair's guess.
http://en.wikipedia.org/wiki/Wisdom_of_the_crowd#Classic_examples