Fine I guess I'll counter.

CREDITS TO Mr. Giang FOR THESE SALES

Sale 1

Before: http://backpack.tf/profiles/76561198127614632?time=1430550000

After: http://backpack.tf/profiles/76561198127614632?time=1430710054

- Sold for 1 bud + 3 keys (8 keys)(OUTLIER)

Sale 2

http://www.tf2outpost.com/trade/25842844 - Sold for a Smoking Helmet Without a Home (10*0.9 = 9 keys)(OUTLIER)

Sale 3

http://www.tf2outpost.com/trade/25697766 - Sold for a Stormy Storm Respectless Rubber Glove (15*0.9 = 14 keys)

Sale 4

Before: http://backpack.tf/profiles/76561198126575570?time=1432278000

After: http://backpack.tf/profiles/76561198126575570?time=1432430016

- Sold for 7 keys + Strange Killstreak Australium Force-A-Nature (21 keys) (Outlier)

Sale 5

http://www.tf2outpost.com/trade/25745330 - BO of 13 keys

Sale 6

http://www.tf2outpost.com/trade/25731158 - Sold with 2 keys for a Kill-a-Watt Steel Shako (13*0.9 - 2 = 10 keys)

And now here's my sales.

Sold for 10 Keys

http://backpack.tf/profiles/76561198045198227?time=1427278183 -> http://backpack.tf/profiles/76561198045198227?time=1427353200

http://www.tf2outpost.com/trade/25413160

Sold for a Kill-a-Watt Bloke's Bucket Hat(13 Keys with Overpay)

http://backpack.tf/profiles/76561198130574296?time=1430526637 -> http://backpack.tf/profiles/76561198130574296?time=1430550000

Sold for an Orbiting Fire Stout Shako(13 Keys with Overpay) and a Strange Spec KS Original(~5 Keys)(18 Keys total)

http://backpack.tf/profiles/76561198102838802?time=1430167324 -> http://backpack.tf/profiles/76561198102838802?time=1430204400

Sold for a Circling Heart Safe'n'Sound(Holy shit)

http://backpack.tf/profiles/76561198107857950?time=1433055600 -> http://backpack.tf/profiles/76561198107857950?time=1433487600

Sold for a Steaming Tyrantium Helmet(18 Keys with Overpay)

http://backpack.tf/profiles/76561198090251227?time=1434265200 -> http://backpack.tf/profiles/76561198090251227?time=1434351600

Sold for an Eerie Orbiting Fire Little Buddy(14 Keys with Overpay)

http://backpack.tf/profiles/76561198155981570?time=1433574000 -> http://backpack.tf/profiles/76561198155981570?time=1433660400

Sold for a Circling Peace Sign Handyman's Handle(13 Keys with Overpay)

http://www.tf2outpost.com/item/440,3827041556,30030,5 Bonk History

http://www.tf2outpost.com/item/440,3825600085,253,5 Handle History

Sold for a Bubbling Little Buddy(14 Keys with Overpay)

http://backpack.tf/profiles/76561198137765764?time=1433660400 -> http://backpack.tf/profiles/76561198137765764?time=1434092400

Quick bubbling buddy mini

1 Month unsold "quickseller" at 16 Key: http://www.tf2outpost.com/trade/25937351

Sales at 8, 9, 10, 10, 13, 13, 13, 14, 14, 14, 18, 18, 21, 30+(lol). Cutting off the first and last 4 off of the range, going with 13-14 which seem to be the common points.

Additional Proof/Counter-Proof/Constructive Criticism/Feedback is always appreciated.