Unpriced.

Valid sales:

Sold for 1 bud + Blizzardy Storm Jumpers Jeepcap (~1 see http://backpack.tf/vote/id/544050aeb88d8885138b45cd ) = 2 buds

http://www.tf2outpost.com/trade/23017242

http://backpack.tf/profiles/76561198108917588?time=1412492400

Sold for Bubbling Buckaroo (~0.5, outdated a few days ago and too cheap to care about a mini) + 1 bud + dirty Summer Hat (~0.7) = ~2.2

http://www.tf2outpost.com/trade/23145252

http://backpack.tf/profiles/76561198094467697?time=1413356400

Invalid sales because of outdated hats I'm too lazy to update or do a mini on but that would seem to be in the valid range anyways:

Sold alongside a Circling Hearts Mongolian (~1) + Bills (~0.3) for a Circling Hearts Whopee Cap (~3.6) = ~2.3 for Thirst

http://www.tf2outpost.com/trade/22888278

http://backpack.tf/profiles/76561198004624438?time=1412060400

Sold for Kill-a-Watt Mann of Reason (~2.5, 5 months outdated, calling it a rough 2 based on the B/O they kept on the MoR for so long)

http://www.tf2outpost.com/trade/23008961 (Thirst)

http://www.tf2outpost.com/trade/23018517 (MoR, B/O of ~2 for over a week)

Outliers:

Sold for a Purple Energy Cowl (~4.3) alongside a Spec. S.F. Scattergun (~2.4) + Pro. Collectors Candy Cane (~7 keys, pro kit is cheap)= ~1.4 for Thirst, outlier

Sold for Disco Beat Down Private Eye (~2.9) + 3 keys = ~3.1, outlier

http://www.tf2outpost.com/trade/22849993

http://backpack.tf/profiles/76561198103948445?time=1411887600

Things I speculate to be outliers even though it involves another unpriced hat because I'm highty doubtful the KaW Thirst is ~5 buds

Sold alongside a Kill-a-Watt Thirst (unpriced) for a Circling Hearts Tyrants Helm (~7.2), outlier

http://www.tf2outpost.com/trade/22944566 (Thirsty)

http://www.tf2outpost.com/trade/23147711 (Tyrant... poor kid, had no idea what he got himself into)

Sellers:

http://www.tf2outpost.com/trade/23062514 - 2.5 buds, 1 week

http://www.tf2outpost.com/trade/22910402 - 6 buds, 2 weeks

http://www.tf2outpost.com/trade/23180869 - no price, young

http://www.tf2outpost.com/trade/23018504 - 3 buds, 1 week

http://www.tf2outpost.com/trade/23153772 - 3.5 buds, 2 days

http://www.tf2outpost.com/trade/23180667 - 12 buds, young, lol

http://www.tf2outpost.com/trade/23124881 - no price, 4 days

http://www.tf2outpost.com/trade/23017455 - no price, 1 week

http://www.tf2outpost.com/trade/23173229 - 3 buds, 1 week

http://www.tf2outpost.com/trade/23018117 - 3 buds, 1 week

http://www.tf2outpost.com/trade/23074957 - no price, 6 days