Sellers:

http://www.tf2outpost.com/trade/22361702 16 Keys, young

http://www.tf2outpost.com/trade/22397177 17 Keys, young

http://www.tf2outpost.com/trade/22224882 17 Keys, 1 week unsold

Solds:

Sold for a Nuts & Bolts Old Guadalajara(11 Keys with Overpay) + 3 Keys(14 Keys total)

http://i.imgur.com/6xXMkTm.png

Sold for a Bubbling Whoopee Cap(14 Keys with Overpay)

http://backpack.tf/profiles/76561198051183707?time=1406444400 -> http://backpack.tf/profiles/76561198051183707?time=1406661203

Sold for an Aces High Broadband Bonnet(12 Keys with Overpay, Outlier)

http://backpack.tf/profiles/76561198051183707?time=1407222000 -> http://backpack.tf/profiles/76561198051183707?time=1407222000

Sold for an Orbiting Planets Frenchman's Beret(16 Keys with Overpay)

http://backpack.tf/profiles/76561198045297884?time=1403247600 -> http://backpack.tf/profiles/76561198045297884?time=1403766000

Considering this guy got offers at more than 12 Keys' worth(Including BMOC + Buck turner, Spec KS Big Kill and 15 Keys) I'm counting it as an outlier. 14-16 Keys should be fine.

http://www.tf2outpost.com/trade/20536304

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