Why are War Pigs so expensive anyway?

1/1 in existence, 1 sale early last month, buyer briefly put this on outpost, saying that it was his dream hat, and then took it off the market after a week.

Sale #1:

Sunbeams Soldier's Stash(duped, needs a mini) + Cloudy Moon Lucky Shot for Purple Energy War Pig:

23.7 *.9 + 7.25*.9 = ~27.9 = ~28

Seller before: http://backpack.tf/profiles/76561198090464845?time=1418198400

Seller after: http://backpack.tf/profiles/76561198090464845?time=1418284800

Buyer before: http://backpack.tf/profiles/76561198057434521?time=1418112000

Buyer after: http://backpack.tf/profiles/76561198057434521?time=1418284800

~~~~~ Mini-Suggestions ~~~~~

Duped Beams Stash

There is only one duped beams stash(at least according to item search), none on the market, 2 recent sales that I could find.

Sold for

Burning Flames Liquidator's Lid + 9 buds pure + 61 keys + BMOC(The lid was offered)

11.25*.9 + 9 + 4.2 + .4 = ~23.7

http://www.tf2outpost.com/trade/23676187

http://backpack.tf/profiles/76561198031566289?time=1415865600

http://backpack.tf/profiles/76561198031566289?time=1415952000

Quicksold in 2 days for 19 buds pure

http://backpack.tf/profiles/76561198090464845?time=1418371200

http://backpack.tf/profiles/76561198090464845?time=1418458668

Some of the offers on the Stash:

http://www.tf2outpost.com/trade/21337613 (V. Gibus, BF AA + BF FFF + FoD ISY taunt + Aussie Black Box)

http://www.tf2outpost.com/trade/23705594 (19 pure, duped sparkle luger + sweets, HOUWAR + Scorching Fuka)

Some of the offers on the War Pig(While it was on outpost):

http://www.tf2outpost.com/trade/24200223 (Scorching Buto + TW Antlers + 7 pure)

~~~~~ Notes ~~~~~

As for most of my high-tier suggestions, I probably did something wrong, and even though I scoured OP and the item histories for half an hour, I might have missed a sale. If I did, please tell me so that I can fix it. As always, any advice, proof and counter-proof are much appreciated :)