Is this illegal?

Sale #1

Sold for a KaW Killer Exclusive minus 2 buds (this was in January)

KaW was 94-104 keys 6 months ago (February) http://backpack.tf/stats/Unusual/Killer%20Exclusive/Tradable/Craftable/56

Bud was going for 14 keys at the time

http://backpack.tf/vote?quality=6&item=Earbuds&tradable=1&craftable=1&state=0,1,2&unvotable=1&australium=-1&killstreak_tier=&page=35 (35th page, accepted)

Backpack of seller:

http://backpack.tf/profiles/76561198152878663?time=1420444800 - before

http://backpack.tf/profiles/76561198152878663?time=1420531200 - after

99*0.9 – 28 = 61 keys

Sale #2

Sold for a D@D Scotman’s Stove Pipe (this was in January also)

5 months ago it was accepted at the price of 55-65 keys http://backpack.tf/stats/Unusual/Scotsman's%20Stove%20Pipe/Tradable/Craftable/90

Backpack of buyer:

http://backpack.tf/profiles/76561198072617627?time=1420444800 - before

http://backpack.tf/profiles/76561198072617627?time=1420617600 - after

60*0.9 = 54 keys

Sale #3

Sold for a Flaming Lantern Napper’s Respite (just today) -50 keys

http://imgur.com/GsYAeiW,nuEd0fR

50*0.9 = 45

This is taking a final price of 45-61 keys.

Mini on Napper’s:

I couldn’t find any recent sales on it

http://steamcommunity.com/profiles/76561198041235843 - selling it for 50 keys

If you’re jimmies are rustled by something please comment below, don’t know if I can do this or not but I’m gonna try it out, thanks.