No one is buying this for 3 ref. Those selling at 2.66 ref are also unsold. Proof below:

Selling for 2.66 ref:

http://www.tf2outpost.com/trade/8723043 (2 days ago)

http://www.tf2outpost.com/trade/8694207 (4 days ago)

Unsold for 3 ref:

http://www.tf2outpost.com/trade/8740079 (2 days ago)

http://www.tf2outpost.com/trade/8744116 (2 days ago)

http://backpack.tf/classifieds/search/356/1/0 (5 days)

Being offered 2.66 ref:

http://www.tf2outpost.com/trade/8627548 (seller added him, trade didn't go through)

You might be wondering why are there only 5 links as proof over here. The rest of the trades are unsold at a out-of-range price 1 key, which is why I didn't include them in here.