Counter. 7 Keys is ridiculously low.

Sold with an After Eight Doublecross Comm(~2) for an Aces High Slick Cut(11 Keys with Overpay)(9 Keys total)

http://backpack.tf/profiles/76561198158197118?time=1427850249 -> http://backpack.tf/profiles/76561198158197118?time=1428303600

Sold for an Australium Tomislav(~9 Keys with Overpay)

http://backpack.tf/profiles/76561198061445479?time=1429599600 -> http://backpack.tf/profiles/76561198061445479?time=1429599600

Sold for an Orbiting Planets Frenchman's Beret(11 Keys with Overpay)

http://backpack.tf/profiles/76561198107838022?time=1430031600 -> http://backpack.tf/profiles/76561198107838022?time=1430550000

Sold for an Orbiting Planets Outdoorsman(11 Keys with Overpay)

http://backpack.tf/profiles/76561198058227270?time=1427266800 -> http://backpack.tf/profiles/76561198058227270?time=1427376095

Sold with a Gold Botkiller Scattergun Mk.II(~3 Keys) for a Steaming Scotsman's Stovepipe(12 Keys with Overpay)(9 Keys total)

http://backpack.tf/profiles/76561198100164598?time=1428476400 -> http://backpack.tf/profiles/76561198100164598?time=1428562800

Credits to SpecialOfficerDoofy for the following sales:

http://backpack.tf/profiles/76561198084056439?time=1430204400 sold for 7 keys http://backpack.tf/profiles/76561198084056439?time=1430290800

http://www.tf2outpost.com/trade/25831947 Sold in 1 Day, quicksell

http://backpack.tf/profiles/76561198092242529?time=1428044400 sold for 8 keys http://backpack.tf/profiles/76561198092242529?time=1428130800

http://www.tf2outpost.com/trade/25569597 Sold in 1 Day, quicksell

http://backpack.tf/profiles/76561198109508282?time=1427526000 sold for 8 keys http://backpack.tf/profiles/76561198109508282?time=14276124001

Since the sale above sold in a day also, regarding this as an outlier.

http://backpack.tf/profiles/76561198158197118?time=1427612400 sold with ~4 Keys in Sweets for Miami Ol' Snaggletooth (~23 keys)(19 Keys total, Outlier) http://backpack.tf/profiles/76561198158197118?time=1427785200

Snaggletooth mini-suggestion

http://backpack.tf/profiles/76561198140580949?time=1430118000 traded for a Kill-a-Watt Modest Metal Pile of Scrap (25 keys) http://backpack.tf/profiles/76561198140580949?time=1430550000

7-8 Is in the quicksell range, 9-11 is more common. 9-11 Keys should be fine.

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