Proof:

http://www.tf2outpost.com/trade/15002888 - Sold for 1 key or something worths a key or 6 ref in less than a day

http://www.tf2outpost.com/trade/14983734 - Sold for 6 ref in less than a day

http://www.tf2outpost.com/trade/14991766 - Sold for 6 ref in less than a day

http://www.tf2outpost.com/trade/14995851 - Sold for 6 ref in less than a day

http://www.tf2outpost.com/trade/15004988 - Sold for 6 ref in less than a day

http://www.tf2outpost.com/trade/15017234 - Sold 1 for 6 ref in less than 16 hours

http://www.tf2outpost.com/trade/15028437 - Sold for 1 key or 6 ref within a bump (it means it sold within the first bump of posting it)

http://www.tf2outpost.com/trade/15018400 - Sold for 1 key or 6 ref within a bump

http://www.tf2outpost.com/trade/15004104 - Sold for 1 key in less than a day

http://www.tf2outpost.com/trade/14994481 - Sold for 1 key in less than a day

http://www.tf2outpost.com/trade/14991872 - Sold for 1 key in less than a day

http://www.tf2outpost.com/trade/14991495 - Sold for 1 key in less than a day

http://www.tf2outpost.com/trade/14987947 - Sold for 1 key in less than a day

http://www.tf2outpost.com/trade/14985821 - Sold for 1 key in less than a day

http://www.tf2outpost.com/trade/14996214 - Sold for 1 key in less than a day

http://www.tf2outpost.com/trade/14997061 - Sold for 1 key in less than a day

http://www.tf2outpost.com/trade/14998599 - Sold for 1 key in less than a day

http://www.tf2outpost.com/trade/15009110 - Sold for 1 key in less than 20 hours (trade.tf shows 1 key, you can just ignore this one, too lazy to post pic)

http://tf2tp.com/trade.php?trade=9835132 - Sold for 1 key in less than 12 hours

http://www.tf2outpost.com/trade/15023579 - Sold for 1 key in less than 5 hours

http://www.tf2outpost.com/trade/15012206 - Sold for 1 key within a bump

SO EASY to sell for 6 ref/1 key, really no point in range, since even the "high end" sells within hours anything below is an obvious quicksell