9 seems low for this.

Sold for 10.5 Keys, rounding to 11

http://backpack.tf/profiles/76561198057904444/#!/compare/1455868800/1456128000

Sold for a Cloud 9 Plumber's Pipe(12.5 Keys, rounding to 13, Outlier)(Credits to Funkster for the sale!)

http://i.imgur.com/OL905Ar.png

Sold for ~11 Keys in Mixed items(Credits to Julia for the sale!)

http://i.imgur.com/VqvBQUc.png

Made 13 an outlier due to some sellers at less, 11 Keys should be fine.

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