Offical Skin trade market !!

why Riot don't make a trade market like steam ; steam has official market and many players trade some items ,which they earn from games why don't Riot make the same concept. for example, I earn captain Miss fortune in chest it is 975 RP right? so, why don't I trade it with another player who has blood moon thresh with the same price ( 975 ) ! too many players and I one of them earn chests contains skins for champions with other roles we don't play with them !
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