Not a big valid market on this one

Sellers for 3,88 ref:

http://www.tf2outpost.com/trade/23901159 11 hours

Sellers for 4 ref:

http://www.tf2outpost.com/trade/23902961 7 hours

http://www.tf2outpost.com/trade/23892026 1 day

Unsold for 4,22 ref:

http://www.tf2outpost.com/trade/23903067 6 hours

http://www.tf2outpost.com/trade/23854010 4 days (very badly bumped)

Classifieds:

1 at 3.88 ref

4 at 4 ref

2 at 4.11 ref

1 at 4.22 ref

So, 4,22 ref doesn't seem to be selling, most common trading point is 4 ref and the 3,88 ref trade is a young quicksell, so 4 ref for the price

All counter/supportive proof is welcomed