Resuggesting (dunno why I closed it last time, maybe I was drunk).

Solds:

I bought this for a Miami Valley Forge + 3.5 keys in items (~3.45)

0.9*3.45 = ~3.1

Proof: http://imgur.com/wxZ8zcU

Sold for a Demonflame Magistrate's* (~2.75)

Backpack before: http://backpack.tf/profiles/76561198053863298?time=1404802800

Backpack after: http://backpack.tf/profiles/76561198053863298?time=1405234800

0.9*2.75 = 2.5

*Mini on Magistrate's:

Sold for a DBD Letch's Led (~3.9)

Backpack before: http://backpack.tf/profiles/76561198042132655?time=1404716400

Backpack after: http://backpack.tf/profiles/76561198042132655?time=1404802800

0.9*3.9 = ~3.5

Sold for a Knifestorm Birdcage (2.25)

Backpack before: http://backpack.tf/profiles/76561198089942274?time=1404370800

Backpack after: http://backpack.tf/profiles/76561198089942274?time=1404457200

0.9*2.25 = ~2