Sale 1 :

Before : http://backpack.tf/profiles/76561197994269089?time=1439449200

After : http://backpack.tf/profiles/76561197994269089?time=1439535600

Sold for a Scorching Flames Tough Guy's Toque : 53 * 0.9 = 48 keys

Sale 2 :

Before : http://backpack.tf/profiles/76561198064246025?time=1434783600

After : http://backpack.tf/profiles/76561198064246025?time=1434870000

Sold for an Anti-Freeze Prancer's Pride : 48 * 0.9 = 43 keys

Sale 3 :

Before : http://backpack.tf/profiles/76561198117003070?time=1434438000

After : http://backpack.tf/profiles/76561198117003070?time=1434524400

Sold for a Sulphurous Attendant ( 48 ) but 2 keys in items were added : 46 * 0.9 = 41 keys

Sale 4 :

Before : http://backpack.tf/profiles/76561198045380923?time=1433833200

After : http://backpack.tf/profiles/76561198045380923?time=1434265200

Sold for a duped Misty Skull Hound Dog : 46 * 0.9 = 41 keys

Mini on the duped hound :

Before : http://backpack.tf/profiles/76561198100895756?time=1432882800

After : http://backpack.tf/profiles/76561198100895756?time=1432969200

Sold for a Electrostatic Backwards Ballcap ( 76 ) but a spec ks aussie minigun was added ( 30 ) : 76 - 30 = 46 keys

Rounding the range to 40-50 keys.

Supportive criticism welcome