I've got the power.

Sale 1

Sold for an Overclocked Trilby (23.5) + Strange MW Pink Elephant (mini at 10) + 1 key

http://backpack.tf/profiles/76561198238587528#!/compare/1471910400/1471996800

http://www.tf2outpost.com/trade/28354187 ----- B/O was 28 keys

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Mini for the Pink Elephant: Sales on August at around ~$24 (~10 keys)

http://steamcommunity.com/market/listings/440/Strange%20Pink%20Elephant%20Stickybomb%20Launcher%20%28Minimal%20Wear%29

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=======> 23.5 + 10 + 1 = 34.5 = Capped at 28 keys

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Sale 2

No idea

http://backpack.tf/profiles/76561198059065962#!/compare/1466208000/1466380800

http://backpack.tf/profiles/76561198042938501#!/compare/1466294400/1466380800

No Outpost trade

=======> Not using

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Sale 3

Sold with a Stormy Whoopee (16) for a Hearts Demo Fro (37)

http://backpack.tf/profiles/76561198032176942#!/compare/1469059200/1469145600

http://www.tf2outpost.com/trade/28353498 ----- B/O was 35 keys

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Mini for the Whoopee: Sold for 16 keys

http://backpack.tf/profiles/76561198032176942#!/compare/1469750400/1469836800

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=======> 37 - 16 = 21 keys

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Sale 4

Sold for a Planets War Pig (outdated at 27.5) + Strange Spec. Ks. Festive Sniper Rifle (~9 keys)

http://backpack.tf/profiles/76561198068180717#!/compare/1468713600/1468800000

http://www.tf2outpost.com/trade/28338684 ----- B/O was 30 keys

Will easily cap at the B/O.

=======> 30 keys

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Sellers

- http://www.tf2outpost.com/trade/28365045 ----- 39 keys for a month.

Buyers

- http://www.tf2outpost.com/trade/26576403 ----- 23 keys

Summary

- Sales for 21, 28, 30. Buyer for 23.

Going with 28-30 keys. 21 is clearly too low considering that Outpost buyer. Criticism appreciated!