Sale #1 (December 7th):

Rebel Rouser > 18 keys

Rebel Rouser: http://www.tf2outpost.com/trade/24026386

Buyer's BP:

Before: http://backpack.tf/profiles/76561198044669156?time=1417852800

After: http://backpack.tf/profiles/76561198044669156?time=1417939200

18 + 2 = 20 keys

Buds = 13.25 keys

18 / 13.25 = 1.358 = 1.4

1.4

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Sale #2 (November 26th):

Rebel Rouser > Ace's High Bubble Pipe (2)

Rebel Rouser: http://www.tf2outpost.com/trade/23875539

Bubble Pipe: http://www.tf2outpost.com/trade/23719956

Seller's BP:

Before: http://backpack.tf/profiles/76561198089917454?time=1416902400

After: http://backpack.tf/profiles/76561198089917454?time=1416988800

2 * 0.9 = 1.8

1.8

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Sale #3 (November 23rd):

Rebel + 4 keys > Miami Nights Defiant Spartan (1.75)

Rebel: http://www.tf2outpost.com/trade/23825466

Spartan: http://www.tf2outpost.com/trade/23795522

Seller's BP:

Before: http://backpack.tf/profiles/76561198008432001?time=1416729600

After: http://backpack.tf/profiles/76561198008432001?time=1416816000

Buds = 14.75 keys

4 / 14.75 = 0.27 buds

1.75 * 0.9 = 1.575

1.575 - 0.27 = 1.3

1.3

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Sale #4 (November 23rd):

Rebel + 6 ToD Tickets (~3 keys) + 3 keys > Duped Stormy Storm Texas Ten Gallon (1.8)

Rebel: http://www.tf2outpost.com/trade/23840409

Seller's BP:

Before: http://backpack.tf/profiles/76561198025079391?time=1416729600

After: http://backpack.tf/profiles/76561198025079391?time=1416816000

Buds = 14.75 keys

6 / 14.75 = 0.406 buds

1.8 * 0.9 = 1.62

1.62 - 0.406 = 1.214

1.2

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Sale #5 (November 22nd):

Rebel > Duped Searing Plasma Tippler's Tricorne (1) + 6 keys

Rebel: http://www.tf2outpost.com/trade/23806271

Tricorne: http://www.tf2outpost.com/trade/23787481

Buyer's BP:

Before: http://backpack.tf/profiles/76561198025079391?time=1416556800

After: http://backpack.tf/profiles/76561198025079391?time=1416643200

Buds = 14.75 keys

6 / 14.75 = 0.406 buds

1 * 0.9 = 0.9

0.406 + 0.9 = 1.306 = 1.3

1.3

Minis:

Duped Stormy Storm Texas Ten Gallon (January 1st):

Ten Gallon > Disco Beat Down Texas Tin-Gallon (2)

Ten Gallon: http://www.tf2outpost.com/trade/24223969

Tin-Gallon: http://www.tf2outpost.com/trade/24375282

2 * 0.9 = 1.8

1.8

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Duped Searing Plasma Tippler's Tricorne (November 27th):

Tricorne > 1 bud

Tricorne: http://www.tf2outpost.com/trade/23841417

Seller's BP:

Before: http://backpack.tf/profiles/76561198074224602?time=1416902400

After: http://backpack.tf/profiles/76561198074224602?time=1417075200

1

Conclusion:

With several sales around 1.2-1.4, the single sale at 1.8 is an easy outlier.