Proof below. 4 month-old price.

Clean only

Sales:

http://www.tf2outpost.com/trade/18097260

-wanted 6 buds

-seller's bp:

http://backpack.tf/profiles/76561198009471724?time=1394265600

http://backpack.tf/profiles/76561198009471724?time=1394352000

-sold for ge beret (outdated)+1 bud+3 keys+lots of sweets=6 buds due to price as it's much higher than 6

http://www.tf2outpost.com/trade/16658813

-phantom+items ( http://www.tf2outpost.com/trade/17776693 ) sold for clean burning tree=~5.6 buds

http://www.tf2outpost.com/trade/17554059

-sold for logo berliners+stormy hard top+o.f. barnstormer+bubbling jeepcap+oc stuntman (all outdated)=6.3 buds, prolly lower and obviously can't use this

http://www.tf2outpost.com/trade/15701357

-b/o of 6.5 buds

-phantom+4 buds+13 keys seem to have sold for clean burning phantom

-seller's bp:

http://backpack.tf/profiles/76561198066996002?time=1389859200

http://backpack.tf/profiles/76561198066996002?time=1390032000

-~3.9 buds, clear outlier

Current trades:

http://www.tf2outpost.com/trade/18075472

Sales: 3.9, 5.6, 6, 6.3

Self explanatory really. Few sales and few cleans. People are still lowballing because of this price.