Counter suggestion with proof more according to the suggested price. I did take some of your links Rufos, so please don't murder me for that

http://backpack.tf/classifieds/search/264/11/0

there's one for 21

http://www.tf2outpost.com/trade/9458822

buyer, has a C/O of 19

http://www.tf2outpost.com/trade/9731648

willing to sell at 20

http://www.tf2outpost.com/trade/9744851

willing to sell at 20

http://www.tf2outpost.com/trade/9759336

seller at 19, considering this an outlier, and it's sold

http://www.tf2outpost.com/trade/9758787

sells 2 at 19

http://www.tf2outpost.com/trade/9787027

seller at 19

http://www.tf2outpost.com/trade/9790706

unsold at 22 (5 hours)

http://www.tf2outpost.com/trade/9790855

unsold at 24

http://www.tf2outpost.com/trade/9768337

unsold at 23

http://www.tf2outpost.com/trade/9686913

somebody accepted 2*#40+2 keys (#40 is 7 keys currently)

http://www.tf2outpost.com/trade/9639520

seller said okay to 19 keys on a pan offer (buying trade)

http://www.tf2outpost.com/trade/9672481

willing to do 20

Also this one, but I don't really get it since I never paid attention in French class (my thanks go to Raida' lt.D, and to Patryk for translating)

http://imgur.com/DQAVlmT pan+5 keys for buds, so 21 keys

sorry, not that much proof this time, but almost all buyers are extreme lowballers and only do 10 keys, and sellers mostly still believe they can get 1-2 buds for this awesome (the best ever) strange

Because of the several 19 links I made that my low end, and 22 as a high end. Yes there are sellers for less, but as we can's see closed trades I am a bit conservative on the drops