Resuggesting

Sale 1 :

Before : http://backpack.tf/profiles/76561198105949351?time=1435906800

After : http://backpack.tf/profiles/76561198105949351?time=1435993200

Sold for a Circling TF Logo Ground Control ( 55 keys ) but 4 keys were added : ( 55 * 0.9 ) - 4 = 46 keys

Sale 2 :

Before : http://backpack.tf/profiles/76561198126869025?time=1435561200

After : http://backpack.tf/profiles/76561198126869025?time=1435734000

Sold for a Scorching Flames Tungsten Toque : 50 * 0.9 = 45 keys

Sale 3 : OUTLIER

Before : http://backpack.tf/profiles/76561198047724382?time=1434870000

After : http://backpack.tf/profiles/76561198047724382?time=1434956400

Sold for a Demonflame Ye Oiled Baker Boy ( 2 in the world no recent valid sales ) : 71 * 0.9 = 64 keys

Calling sale 3 an outlier as this sale http://www.tf2outpost.com/trade/26372893 with a B/O of 60 keys hasn't had an offer in nearly 1 month

Thus taking the flat price of 45 keys

Supportive criticism welcome

PS : Thx to peasant for the help