Most are unsold for a long period of time and many offers. Proof:

http://backpack.tf/classifieds/search/1031/6/0 Sellers of 0.66 (One is quicksell though) and unsuccessful at the current prices

http://www.tf2outpost.com/trade/10459133 Offers, 2 weeks old

http://www.tf2outpost.com/trade/10538728 Offers, Week old

http://www.tf2outpost.com/trade/10420902 Offers, 2 weeks old, Got offered 1 key for a level 69 one (2 weeks old)

http://www.tf2outpost.com/trade/10779458 0.66, 16 hours

http://www.tf2outpost.com/trade/10787955 I believe it offers

http://www.tf2outpost.com/trade/10768235 Offers

http://www.tf2outpost.com/trade/10762445 Offers

http://www.tf2outpost.com/trade/10731797 Offers

http://www.tf2outpost.com/trade/10698449 Offers, 3 days old

http://www.tf2outpost.com/trade/10595016 Offers, Week Old

http://www.tf2outpost.com/trade/10444293 Offers, 2 weeks, No offers under 1 ref

http://www.tf2outpost.com/trade/10564739 Offers, Week Old

http://www.tf2outpost.com/trade/10548764 Offers, Week Old

http://www.tf2outpost.com/trade/10360670 Offers, 2 weeks old

http://www.tf2outpost.com/trade/10644780 Offers, 6 days old

http://www.tf2outpost.com/trade/10524425 Offers on a level 69, Week Old

http://www.tf2outpost.com/trade/10409965 Offers, 2 weeks old

http://www.tf2outpost.com/trade/10363768 Offers, 2 weeks old

http://www.tf2outpost.com/trade/10360255 1 ref or more offers, 2 weeks old

http://www.tf2outpost.com/trade/10360902 Level 100, Offers, 2 weeks old

Might I add the other Poker 2 items are going down