Quickbuyers aren't good proof, those guys are just trying to make a heavy profit over impatient sellers.

Here, some counterproof:

http://www.tf2outpost.com/trade/6812237 (sold for 2 keys)

http://www.tf2outpost.com/trade/6478762 (sold for 4 ref)

http://www.tf2outpost.com/trade/6530621 (sold for 1key + ref)

http://www.tf2outpost.com/trade/6540910 (buyers offering 1key + ref and 4 ref)

http://www.tf2outpost.com/trade/6657473 (buyers offering between 1 and 1.5 keys)

http://www.tf2outpost.com/trade/5352707 (buyers offering between 3 and 4 ref) (the trade is a month old, so check only the 1 week old posts)

http://www.tf2outpost.com/trade/6646451 (sold for 2 keys)

http://www.tf2outpost.com/trade/5970765 (sold for G Awp, 1-1.5 key)

http://www.tf2outpost.com/trade/6663038 (sold for 4 ref)

http://www.tf2outpost.com/trade/6872520 (sold 2 for 4 ref each)

http://www.tf2outpost.com/trade/6918081 (buyer paying 4 ref pure)

http://www.tf2outpost.com/trade/6910332 (buyer paying 4 ref in items)

http://www.tf2outpost.com/trade/6904589 (buyer paying 5.22 ref in items)

http://www.tf2outpost.com/trade/6902138 (buyer paying 4 ref pure)

downvote, too low

Be patient and good things will happen http://puu.sh/1zUVq

link 1 buying at 2.33 got an offer of 2 keys