after seeing that this item was 1 month with the price from 2 to 2.5 keys, I decided to see if it really sold for that price, and found that this item has fallen a little, see:

http://www.tf2outpost.com/trade/12265147 Selling for 2 Keys

http://www.tf2outpost.com/trade/11981823 Selling for 2.2 Keys

http://www.tf2outpost.com/trade/12170222 Selling for 2 Keys

http://www.tf2outpost.com/trade/12435698 Selling for 2 Keys

http://www.tf2outpost.com/trade/12254353 Selling for 2 Keys

http://www.tf2outpost.com/trade/11933044 Selling for 2 Keys

http://tf2tp.com/trade.php?trade=9604274 Selling for 2 Keys

http://tf2tp.com/trade.php?trade=9596606 Selling for 2 Keys

http://tf2tp.com/trade.php?trade=9587364 Sold for 2 Keys

http://tf2tp.com/trade.php?trade=9577250 Selling for 2 Keys

http://tf2tp.com/trade.php?trade=9549472 Selling for 2.2 Keys

http://backpack.tf/classifieds/search/971/11/0 ( in classified exist 6 Sticky Gold MK II, and of these six, four are with the price 2 - 2.2 keys ( 2 sticky for 2 keys, and 2 stickys for 2.2 keys )

http://www.tf2outpost.com/trade/12351844 This guy Trade Sticky Gold bk II for Strange Degreaser ( 2 keys in Backpack )

showed 16 Sticky Gold BK II with price 2 - 2.2 keys