Counter to this suggestion: http://backpack.tf/vote/id/55856774dea9e909288b462a

Sale 1.

http://gyazo.com/0713c4c2580607f80846bec708fa4dd1 Sold for Strange Awp, 13 keys.

Sale 2.

http://gyazo.com/5dd196d74128c3cf7bc8020a9acaddf6 Bought for 11 keys pure.

http://gyazo.com/8f202d13c695de3176acd7e4e2b0f10a Proof of effect for above sale.

Sale 3. credits to ♫Musix♫™ S> Page 1 of bp for this one.

- Imgur: http://imgur.com/dFlyQu9 Sold for a Orb Fire Bucket Hat, outdated.

- Trade: http://www.tf2outpost.com/trade/26210891

Before - http://backpack.tf/profiles/76561198050192159?time=1434351600

After - http://backpack.tf/profiles/76561198050192159?time=1434438000

Mini for the bucket:

http://backpack.tf/profiles/76561198136854716?time=1434697200 Sold with a key for a Miami Nights Base Metal Billycock (15 keys)

http://backpack.tf/profiles/76561198136854716?time=1434783600

(15*0.9) - 1 = 12.5 keys

Only recent sale I could find.