Counter.

Sellers:

http://www.tf2outpost.com/trade/23355279 3 Buds, 1 Week unsold

http://www.tf2outpost.com/trade/23296145 3.2 Buds, 1 Week unsold

http://www.tf2outpost.com/trade/23450403 3.5 Buds, young

http://www.tf2outpost.com/trade/23159091 3.6 Buds, 2 Weeks unsold

http://www.tf2outpost.com/trade/22876049 3.7 Buds, 1 Month unsold

Solds:

Quicksold for 28 Keys(1.8 Buds, Outlier. Also duped)(Credits to VerySpeedBoy for the sale)

http://i.hizliresim.com/rdo5MV.jpg http://i.hizliresim.com/Dk0Y2Z.jpg

Sold for an Electrostatic Glasgow Great Helm(2.8 with Overpay)

http://backpack.tf/profiles/76561198046487200?time=1414533241 -> http://backpack.tf/profiles/76561198046487200?time=1414566000

Sold for an Eerie Orbiting Fire Armored Authority(2.7 with Overpay)

http://backpack.tf/profiles/76561198084247119?time=1414685009 -> http://backpack.tf/profiles/76561198084247119?time=1414738800

Sold for a Memory Leak Towering Pillar of Hats(2.7 with Overpay)

http://backpack.tf/profiles/76561198073175370?time=1414479600 -> http://backpack.tf/profiles/76561198073175370?time=1411858005

Sold for a Cloud 9 Prince Tavish's Crown(2.7 with Overpay, outdated but supports the range)

http://www.tf2outpost.com/item/440,3126466581,383,5 Grimm History

http://www.tf2outpost.com/item/440,3130114126,342,5 Crown History

It seems to be selling quite often at 2.7-2.8, and it's clear that 3-4 doesn't happen anymore. So 2.7-2.8 that should be fine.

Additional Proof/Counter-Proof/Constructive Criticism/Feedback is always appreciated.