Way too high.

Sold for a Misty Skull Your Worst Nightmare(71 Keys, Offered)(B/O was 70)

http://backpack.tf/profiles/76561198047349378?time=1442127600

http://backpack.tf/profiles/76561198047349378?time=1442300400

http://www.tf2outpost.com/trade/27006452

http://www.tf2outpost.com/trade/26999426

Sold for a Burning Flames Larrikin Robin(55 Keys with Overpay), a Miami Nights Buckaroos Hat(15 Keys with Overpay), and ~5 Keys in Sweets(75 Keys total)

http://backpack.tf/profiles/76561198047349378?time=1440486000

http://backpack.tf/profiles/76561198047349378?time=1440658800

http://www.tf2outpost.com/item/440,4070177233,30067,5 Rifleman History

Sold for Aces High Antlers(83 Keys with Overpay)

http://backpack.tf/profiles/76561198047263033?time=1438239600

http://backpack.tf/profiles/76561198047263033?time=1438412400

Sold for a Time Warp Barnstormer(29 Keys with Overpay), a Collector's Pro KS Gunslinger(15 Keys with Overpay) and ~22 Keys in Sweets(20 Keys with Overpay)(66 Keys total)

http://backpack.tf/profiles/76561198084110440?time=1440399600

http://backpack.tf/profiles/76561198084110440?time=1440486000

http://backpack.tf/profiles/76561198092159151?time=1440399600

http://backpack.tf/profiles/76561198092159151?time=1440486000

http://www.tf2outpost.com/item/440,4070177233,30067,5 Rifleman History

Collector's Pro KS Gunslinger mini suggestion

All recent sales on the SCM(Keys = $2.49): http://steamcommunity.com/market/listings/440/Collector's%20Professional%20Killstreak%20Gunslinger

$42.06

$42.06

$26.63

$26.63

$60.41

$60.01

The average comes out at $42.96(Roughly 17 Keys)

Sales seem to fit, 66-83 Keys should be fine.

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