Here are all of the scammers I have seen so far.
OPSkins scammer: http://steamcommunity.com/profiles/76561198371760177
Trusted Friend scammer: http://steamcommunity.com/profiles/76561198165914973
Trusted Friend scammer: http://steamcommunity.com/profiles/76561198076770428
Suspected OpSkins scammer: http://steamcommunity.com/profiles/76561197961713495
Item Duplication scammer: http://steamcommunity.com/profiles/76561198264673133
OPSkins Scammer: http://steamcommunity.com/profiles/76561198388033452
Trusted Friend scammer: https://steamcommunity.com/profiles/76561198089075341
Alt of Trusted Friend Scammer: https://steamcommunity.com/id/765667567567567
Suspected OPSkins Scammer: http://steamcommunity.com/profiles/76561198273566389
OPSkins Scammer: http://steamcommunity.com/profiles/76561197973568492
Phishing Scammer: http://steamcommunity.com/profiles/76561198075295471/
Middleman Scammer: http://steamcommunity.com/profiles/76561197965656933
Alt of Middleman Scammer: http://steamcommunity.com/profiles/76561198199172051
Trusted Friend Scammer: http://steamcommunity.com/profiles/76561198185822201
Alt of Trusted Friend Scammer: http://steamcommunity.com/profiles/76561198367626841
OPSkins Scammer: http://steamcommunity.com/profiles/76561198205421168
OPSkins Scammer: http://steamcommunity.com/profiles/76561197963558009
OPSkins Scammer: http://steamcommunity.com/profiles/76561198320808269
OPSkins Scammer: http://steamcommunity.com/profiles/76561198384678337
OPSkins Scammer: http://steamcommunity.com/profiles/76561198402337470
OPSkins Scammer: http://steamcommunity.com/profiles/76561198170228842
OPSkins Scammer: http://steamcommunity.com/profiles/76561198425700933
Phishing Scammer: http://steamcommunity.com/profiles/76561198042994922
Marketplace.tf Scammer: https://steamcommunity.com/profiles/76561198326016865
BitSkins Scammer: https://steamcommunity.com/profiles/76561198115476031
OPSkins Scammer: https://steamcommunity.com/profiles/76561197964328242
Phishing Scammer: https://steamcommunity.com/profiles/76561198042441780
Phishing Scammer: https://steamcommunity.com/profiles/76561198043304900
Phishing Scammer: https://steamcommunity.com/profiles/76561198062737767
Phishing Scammer: https://steamcommunity.com/profiles/76561198165667848
Phishing Scammer: https://steamcommunity.com/profiles/76561198123193055
Phishing Scammer: https://steamcommunity.com/profiles/76561198185304346
Phishing Scammer: https://steamcommunity.com/profiles/76561198019662648
Unknown Method Scammer: https://steamcommunity.com/profiles/76561198276405406
Phishing Scammer: https://steamcommunity.com/profiles/76561198874670935
Phishing Scammer: https://steamcommunity.com/profiles/76561198798484624
Phishing Scammer: https://steamcommunity.com/profiles/76561198355876705
Phishing Scammer: https://steamcommunity.com/profiles/76561198331065118
Gameflip Scammer: https://steamcommunity.com/profiles/76561198946329100
Fake Tournament Scammer: https://steamcommunity.com/profiles/76561198984205022
Gameflip Scammer: https://steamcommunity.com/profiles/76561198853783070
Phishing Scammer: https://steamcommunity.com/profiles/76561198091713087
Phishing Bot: https://steamcommunity.com/profiles/76561198850950049
Phishing Bot: https://steamcommunity.com/profiles/76561198872887138
Phishing Bot: https://steamcommunity.com/profiles/76561198426690332
Phishing Bot: https://steamcommunity.com/profiles/76561198892912702
Fake Tournament Scammer: https://steamcommunity.com/profiles/76561198348320812
Fake Tournament Scammer: https://steamcommunity.com/profiles/76561199385388490

Kindly report these people if you wish, maybe troll them a little, just make their life harder to scam people.