Pretty hard to sell above 3 keys + 4 ref.

Numerous sales at ~3.5 keys and many below that.

I would say that the number of sales below ~3.5 keys exceeds the number of sales above ~3.7 keys.

Definition of range

3.5 keys ~ 3 keys+3 ref

3.7 keys ~ 3 keys+4 ref

Classifieds

http://backpack.tf/classifieds/search/206/11/0

Sold below 3.5 keys

http://www.tf2outpost.com/trade/12950213 3 keys

http://www.tf2outpost.com/trade/12950201 3 keys

http://tf2tp.com/trade.php?trade=9646062 3 keys

http://www.tf2outpost.com/trade/12954999 3 keys

http://www.tf2outpost.com/trade/12980706 3 keys

http://www.tf2outpost.com/trade/12970484 3 keys

http://www.tf2outpost.com/trade/12965168 3 keys

http://www.tf2outpost.com/trade/12981814 S. Original

http://www.tf2outpost.com/trade/12963039 S. Original

http://www.tf2outpost.com/trade/12982873 3 keys + 1.66 ref

http://www.tf2outpost.com/trade/13002848 3 keys + 2 ref

http://www.tf2outpost.com/trade/12955387 3 keys + 2 ref

http://www.tf2outpost.com/trade/12953790 3 keys + 2 ref

http://www.tf2outpost.com/trade/12942601 3 keys + 2 ref

http://tf2tp.com/trade.php?trade=9650571 3 keys + 2 ref

Sold for ~3.5 keys (3 keys + 3 ref)

http://www.tf2outpost.com/trade/12985279

http://www.tf2outpost.com/trade/12981477

http://www.tf2outpost.com/trade/12968482

http://www.tf2outpost.com/trade/12965914

http://www.tf2outpost.com/trade/12965532

http://www.tf2outpost.com/trade/12948552

http://www.tf2outpost.com/trade/13003212 3 keys + 3.33 ref

Selling for ~3.5 keys (3 keys + 3 ref)

http://www.tf2outpost.com/trade/12965666

http://www.tf2outpost.com/trade/12966781

http://tf2tp.com/trade.php?trade=9648491

http://www.tf2outpost.com/trade/12988426

http://www.tf2outpost.com/trade/12994710

http://www.tf2outpost.com/trade/13001612

http://www.tf2outpost.com/trade/13002358

http://www.tf2outpost.com/trade/13005870

http://www.tf2outpost.com/trade/13005564

http://www.tf2outpost.com/trade/12991667 3 keys + 3.33 ref

http://www.tf2outpost.com/trade/13004530 3 keys + 3.33 ref

http://www.tf2outpost.com/trade/12953068 3 keys + 3.66 ref

Sold for ~3.7 keys (3 keys + 4 ref)

http://www.tf2outpost.com/trade/12948226

http://www.tf2outpost.com/trade/12950281

http://www.tf2outpost.com/trade/12966099

http://www.tf2outpost.com/trade/12980762

http://www.tf2outpost.com/trade/12995991

http://www.tf2outpost.com/trade/12996938

Selling for ~3.7 keys (3 keys + 4 ref)

http://www.tf2outpost.com/trade/12856584 4 days

http://www.tf2outpost.com/trade/12881217

http://www.tf2outpost.com/trade/12980279

http://www.tf2outpost.com/trade/12986307

http://tf2tp.com/trade.php?trade=9649227

http://tf2tp.com/trade.php?trade=9650564

http://www.tf2outpost.com/trade/13001612

Selling for 4 keys

http://www.tf2outpost.com/trade/12735066 1 week

http://www.tf2outpost.com/trade/12784620 6 days

http://www.tf2outpost.com/trade/12883712 3 days

http://www.tf2outpost.com/trade/12890946 3 days

http://www.tf2outpost.com/trade/12913532 (4 keys-1.33 ref) 2 days

http://www.tf2outpost.com/trade/12936745 2 days