Stealing price suggestions... is it illegal?

Sales:

http://www.tf2outpost.com/trade/13066477 - B/O of 16, Sold for a Smoking OMA (~15) + 3 = ~18

http://www.tf2outpost.com/trade/12963572 --> http://www.tf2outpost.com/trade/13084454

Sold for 1 Bud (~22 2 Months Ago) if the seller returns 4 = ~18.

http://backpack.tf/vote/id/5206b4d5ba25360169000001

Legit Trades:

http://backpack.tf/classifieds/search/id/523679a34f96f424588b4567

2 Up for 16.

http://www.tf2outpost.com/trade/13887596 - Highest Offer of 16 in a month.

http://www.tf2outpost.com/trade/14268432 - B/O of 16.

http://www.tf2outpost.com/trade/14092944 - Has a willing buyer at 17.

http://www.tf2outpost.com/trade/13831399 - Offer of 17.

Offer of a Logo Mullet (~18) + 1 Key = ~19

Offer of a Steaming Baker Boy (~20)

Offer of a Blizzard Scotch (~16)

http://www.tf2outpost.com/trade/13816019 - B/O of 16.

http://www.tf2outpost.com/trade/13616390 - B/O of 16.

The original suggester is now offline???

A range of 16-17 keys was preferred in the comments.

For reference: http://backpack.tf/vote/id/5247a5514cd7b833718b4568