C'mon people, give me the right advice

First link:

http://www.tf2outpost.com/trade/22092146 Bought for a Collector's Fortified Compound(19 Keys) - http://www.tf2outpost.com/trade/21938069

Collector's Fortified Compound(19 Keys)*0.9 = 17.1 rounding to 17

Total ~ 17 Keys

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Second link:

http://www.tf2outpost.com/trade/22092146 Sold for an Orbiting Planets Hound Dog(19 Keys) - http://www.tf2outpost.com/trade/22196199

Orbiting Planets Hound Dog(19 Keys)*0.9 = 17.1 rounding to 17

Total ~ 17 Keys

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Third link(outlier):

http://www.tf2outpost.com/trade/22188060 + http://www.tf2outpost.com/trade/22183657 + http://www.tf2outpost.com/trade/22212739 Where sold for a Terror-Watt Toy Soldier(2.8 Buds)

Stormy Storm Shooter's Sola Topi(1.2 Buds) + Bill's Hat(0.3 Buds) = 1.5 Buds

1.5*0.9 = 1.35 rounding to 1.4

2.8-1.4 = 1.4

Total = 1.4 Buds

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Current seller's:

http://www.tf2outpost.com/trade/22239086 1 Bud

http://www.tf2outpost.com/trade/22190135 21 Keys(1.1 Buds)

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Any feedback is appreciated!