http://backpack.tf/classifieds/search/id/521d757a4f96f4e60b8b4567 (1 at 1.4, 3 at 1.5, lots at 1.8)

Proof:

Unsolds:

1.8 keys:

http://www.tf2outpost.com/trade/14449417 (1 month, not too many recent sales)

http://www.tf2outpost.com/trade/16077833 (<1 day)

http://www.tf2outpost.com/trade/16061119 (1 day)

http://www.tf2outpost.com/trade/16084397 (<1 day)

http://www.tf2outpost.com/trade/16021490 (2 days)

http://www.tf2outpost.com/trade/16095866 (<1 day)

http://www.tf2outpost.com/trade/16040200 (2 days)

http://www.tf2outpost.com/trade/16090444 (<1 day)

http://www.tf2outpost.com/trade/15852121 (1 week)

http://www.tf2outpost.com/trade/16054599 (1 day)

1.75 keys:

http://www.tf2outpost.com/trade/15976809 (4 days)

1.7 keys:

http://www.tf2outpost.com/trade/16055665 (1 day)

Selling:

1.66 keys:

http://www.tf2outpost.com/trade/15899102 (1 week)

http://www.tf2outpost.com/trade/16095623 (<1 day)

http://www.tf2outpost.com/trade/16097202 (<1 day)

http://www.tf2outpost.com/trade/16035055 (2 days)

http://www.tf2outpost.com/trade/16085744 (<1 day)

1.6 keys:

http://www.tf2outpost.com/trade/16092172 (<1 day)

http://www.tf2outpost.com/trade/16041704 (2 days)

1.5 keys:

http://www.tf2outpost.com/trade/16095310 (<1 day)

http://www.tf2outpost.com/trade/16049419 (1 day)

http://www.tf2outpost.com/trade/16016051 (3 days)

http://www.tf2outpost.com/trade/16091243 (<1 day)

http://www.tf2outpost.com/trade/16087665 (<1 day)

1.33 keys:

http://www.tf2outpost.com/trade/16078994 (<1 day)

1.8 ref:

http://www.tf2outpost.com/trade/16097441 (He probably means keys...)

Don't agree with 1.5 flat. 1.5 is not the majority market yet. It's clear 1.8 no longer sells, 1.66 on the other hand...

Thanks for voting : )