thanks to dr1ftec and polar for additional proof

OLD PROOF

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Sale #1

Sold for a CM Tavish + Beams Sack + Pro KS Aus Blut

http://www.tf2outpost.com/trade/24045581

7.2 + 2.9 + 1.2 = 11.3 * 0.9 = 10.2, rounding to 10

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Mini on Tavish

~7.2

http://backpack.tf/vote/id/549600aeba8d8853358b4569

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Mini on Blut

Monthly Average of ~39 USD

http://steamcompanion.com/tf2/Strange-Professional-Killstreak-Australium-Blutsauger/

39 / 2.5 = ~15 keys

b/os line up

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NEW PROOF

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Sale #2

Offered on RA Armored Authority + Phosphorous Lucky

http://www.tf2outpost.com/trade/24155459

5.7 + 4.5 = 10.2

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Sale #3

Offered with sweets for a Burning Swag

http://backpack.tf/profiles/76561198092159151?time=1419148800

~10.5

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Polar's comment;

'I think the degroot value is a bud low and the range should be 10-11 here'