Unsold above 1.66:

http://www.tf2outpost.com/trade/10274770 (1 key)

http://www.tf2outpost.com/trade/9854127 - (3 ref)

http://www.tf2outpost.com/trade/10547817 - (3 ref)

http://www.tf2outpost.com/trade/9764428 - (3, no offers)

http://www.tf2outpost.com/trade/10492146 - (2-3)

http://www.tf2outpost.com/trade/10565848 - (2-3)

http://www.tf2outpost.com/trade/10561372 - (2.44)

http://www.tf2outpost.com/trade/10568389 - (2.33)

http://www.tf2outpost.com/trade/9881009 - (2.33)

http://www.tf2outpost.com/trade/10277939 - (2.33)

http://www.tf2outpost.com/trade/10263075 - (2-2.33)

http://www.tf2outpost.com/trade/10431592 - (2)

http://www.tf2outpost.com/trade/10588342 - (2)

http://backpack.tf/classifieds/search/last%20straw - (2)

http://www.tf2outpost.com/trade/10563095 - (2)

http://www.tf2outpost.com/trade/10587063 - (2)

http://www.tf2outpost.com/trade/10586281 - (2)

http://www.tf2outpost.com/trade/10244013 - (2)

http://www.tf2outpost.com/trade/10302063 - (2)

http://www.tf2outpost.com/trade/10515303 - (2)

http://www.tf2outpost.com/trade/10559951 - (2)

http://www.tf2outpost.com/trade/10528936 - (2)

http://www.tf2outpost.com/trade/10577646 - (1.88)

http://www.tf2outpost.com/trade/10584066 - (wants bp.tf price, about 1.77/1.88, unsold)

http://www.tf2outpost.com/trade/10591218 - (1.77)

Offers /Sales of 1.66 or below:

http://www.tf2outpost.com/trade/9855425 - (wants 2, offered 1.66)

http://www.tf2outpost.com/trade/10400701 - (wants 2, offered 1.66)

http://www.tf2outpost.com/trade/10398005 - (wants 2, offered 1.66 twice)

http://www.tf2outpost.com/trade/10088571 - (wants 2, offered 1.66)

http://www.tf2outpost.com/trade/10256622 - (wants 2, offered 1.66)

http://www.tf2outpost.com/trade/10428998 - (offered 1.66, wants more)

http://www.tf2outpost.com/trade/10365303 - (declines two offers of 1.66, feels it is worth more)

http://www.tf2outpost.com/trade/9949215 - (wants 2, offered 1.33)

http://www.tf2outpost.com/trade/10425450 - (wanted 1.77, agrees on 1.66)

http://www.tf2outpost.com/trade/9818624 - (offered 1.33, and 1.66)

http://www.tf2outpost.com/trade/10449368 - (willing to sell for a 1.66 hat)

http://www.tf2outpost.com/trade/10194916 - (multiple adds for 1.66)

http://backpack.tf/classifieds/search/straw - (one for 1.66)

Trades with 0 offers:

http://www.tf2outpost.com/trade/10528639

http://www.tf2outpost.com/trade/10262912

http://www.tf2outpost.com/trade/10532218

http://www.tf2outpost.com/trade/10593872

http://www.tf2outpost.com/trade/9949204

http://www.tf2outpost.com/trade/8172246

http://www.tf2outpost.com/trade/10566679

What I have tried to show is that no-one selling for above 1.66 has had any interest really. This can be attributed to a lack of demand, as illustrated by the multiple trades with absolutely no offers! However people have offered 1.66 multiple times on some trades, and there are some successful trades for people selling at 1.66.

To sum up.

No/few sales above 1.66

No offers on many trades = no demand

Multiple offers / successful trades at 1.66

Sorry if there are duped links etc etc, I am quite tired and this is my third or fourth suggestion made today!

Edit: Have just seen this too: http://backpack.tf/vote/id/518668f44bd7b8247500000f - Didn't realise someone was calling for 1.66-1.88. I feel their proof is worse than mine and their price reduction, too conservative.