whats the difference between these and antlers?

http://www.tf2outpost.com/trade/15140524 sold for burning pith(4.5) + 2 = 6.5 <- outlier

http://www.tf2outpost.com/trade/14767465 sold for blizz crones(7.5) + blizz whopee(0.9) + 6 keys + vintage luger + crate #50 = 1 (9.4), rejected 8.5 buds

http://www.tf2outpost.com/trade/13990184 sold for PE rack(3.8) + sf rocket launcher + ~3 buds = 8.8

http://www.tf2outpost.com/trade/15283250 sold for burning hotrod(9)

http://www.tf2outpost.com/trade/14675353 sold for 3.5 + stormy modest(3.4) + max's head = ~9

http://www.tf2outpost.com/trade/13494015 sold for 9 buds

http://www.tf2outpost.com/trade/14496708 2:1 with harvest tyrolean unknown value of 2nd hat

most sales between 9 and 9.5, 1 unknown sale, and 1 at 6.5

8.8-9.4 is fair