Why don't players take ranked seriously?

Is it because it's preseason, and the wins/losses won't have much effect on S7 placement? But every game I have been in (SoloQ) has been full of flamers, AFKers, and people just pissing about? "I'll 1v1 you!" , "I have to go now bye", "first time with [champion]" etc I thought that ranked is supposed to be the place for serious competitive play?
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