I will drop this, so that I can buy this! (I'll never be able to buy this.)

Sale #1 (Outlier, only latest sale.)

Sold for Strange Specialized Killstreak Medigun with Allied Healing along with a Stormy Puglist, a Strange Pan, and 6 keys worth of sweets.

https://backpack.tf/profiles/76561198053838243?time=1446274800&compare=1446361200

Calculating, Puglist is 12 keys, and Pan is 7, So putting the value of the bonnet at x, {x+(12*0.9)+7+6}=27, which equates to (x+10.8=14) which means the Bonnet was sold at around 3 keys value.

Seller #1

http://www.tf2outpost.com/trade/27539557

http://imgur.com/GyKdxuX

Selling at 25 keys, hasn't been sold in 2 months.