Hello, and welcome to my first suggestion with actual proof c: (I know, shocking)

Trading:

Selling: (greatest to lowest)

http://www.tf2outpost.com/trade/12124131 (Trade made to 1:1 for an unusual orbiting planet milkman, orbiting planet milkman unusual range 1.3 buds = 30 keys)

http://www.tf2outpost.com/trade/12049275 (18 keys for SET, Fast Learner is 4 ref, so the hat itself is 17.2 keys)

http://www.tf2outpost.com/trade/12139844 (My personal trade: 16 keys B/O)

http://www.tf2outpost.com/trade/12114054 (See in offers, asking for 15 keys instead of 14)

http://www.tf2outpost.com/trade/11538464 (Selling for $30, roughly 15 keys at the price of $2.00 per key [price of keys last time I checked])

SOLD!

http://www.tf2outpost.com/trade/9615547 (sold for flies beret, which is backpack.tf 16-18 keys)

http://imgur.com/lyeVTsJ (I traded for 15 keys with another user)

http://www.tf2outpost.com/trade/10290105 (1 BUD PURE!!!! http://goo.gl/71FUk)

http://www.tf2outpost.com/trade/9318427 (Offered 23 keys for it! http://goo.gl/71FUk)

http://www.tf2outpost.com/trade/9544353 (B/O of 17 keys)

http://www.tf2outpost.com/trade/9319963 (B/O of 20 keys, inferred that it was bought with 20 keys or overpay by bottom comment/offer)

Math for pricing: (all prices, not just active ones)

(average)

[30 keys (outlier of stats) + 17 keys + 16 keys + 15 keys + 16 keys + 15 keys+ 15 keys + 23 keys(bud) + 23 keys + 17 keys + 20 keys]/11 = 18.8 keys (rounded 19 keys)

(range)

30 keys - 15 keys = 15 keys

(median)

16.5 keys

(mode)

15 keys

IT'S THEMED!(cough.... completely not forced... cough)

It's an aviator hat, aviators fly in the sky! The sky is connected to space! Aviators dream of traveling to the orbiting planets that are in... SPACE! Baddaboo baddabbing, it's themed!

Stats (if you are interested)

Pages on Outpost: 1

In Sets: 1

Painted: Very Common

Oddly Leveled: Uncommon.

#s of this effect and hat: 34