I guess I should try to get that purple belt, eh?

inb4 Everyone thinks a war is happening, so the open the suggestion and realize it's just a bunch of st00pidness.

Sale #1: Outlier...

Sold for 75 keys?

Backpack before: http://backpack.tf/profiles/76561198148511293?time=1433314800

Backpack after: http://backpack.tf/profiles/76561198148511293?time=1433409126

Sale #2: Bulk, not interested in it. Also Cannonball is unpriced.

Bulk sale for a DaD Human Cannonball

Backpack before: http://backpack.tf/profiles/76561198159509740?time=1433013648

Backpack after: http://backpack.tf/profiles/76561198159509740?time=1433055600

Sale #3: 138 + 11.5 = 149.5 * 0.9 = ~135 keys

Sold for a C9 Crones Dome + Stormy Storm Football helm

Backpack before: No backpack before.. but Histories match up. http://backpack.tf/item/281847920 Sold from GreatEclipse -> ☆☆☆☆

Backpack after: http://backpack.tf/profiles/76561198042132655?time=1433012515

Sale #4: ~89 keys

Sold for a Sunbeams Waxy Wayfiner

Backpack before: http://backpack.tf/profiles/76561198081134005?time=1431673200

Backpack after: http://backpack.tf/profiles/76561198081134005?time=1431806827

Sale #5: 35 * 0.9 = ~32 + 75 = 107 keys

Sold for a Green Energy Hottie's Hoodie + Searing Plasma Pyromancer's Mask

Backpack before: http://backpack.tf/profiles/76561198124406457?time=1431231973

Backpack after: http://backpack.tf/profiles/76561198124406457?time=1431327600

Sale #6: 102 * 0.9 = ~92 - 4 = ~88 keys

Sold for with a Strange Huntsman for a Burning Slug

http://backpack.tf/profiles/76561198057160393?time=1430031600

http://backpack.tf/profiles/76561198057160393?time=1430118000

Minis:

Stormy Storm Football helm: 11.5 keys

http://www.tf2outpost.com/trade/26119448 - 11.5 key seller

Sunbeams Waxy Wayfinder: 93 * 0.9 = ~84 keys + 5 = ~89 keys

Sold for Ghosts Exquisite Rack + 5 keys

Backpack before: http://backpack.tf/profiles/76561198081134005?time=1432105200

Backpack after: http://backpack.tf/profiles/76561198081134005?time=1432195064

Searing Plasma Pyromancer: 75 keys

Sold for 75 keys

Backpack before: http://backpack.tf/profiles/76561198073266358?time=1432012640

Backpack after: http://backpack.tf/profiles/76561198073266358?time=1432018800

Multiple buyers for burning Napper's Respite's for 75 keys.

http://www.tf2outpost.com/trade/25939077

http://www.tf2outpost.com/trade/25372899

http://www.tf2outpost.com/trade/26007383

There are more buyers, three trades of buyers at 75 should suffice. This is to conclude that ~87 and ~89 are both outliers.