Someone that leaves a "5-20 at 15 minutes" game is not a rage quitter, he's a realist. I can be classified as a "chronic rage quitter" as I tend to leave a lot of hopeless games which more often than not, encourage the wrath of my team mates. I don't care of course but that's not what this is about. You are being extremely deceptive. You're acting like these people conspire to fuck up your matches or something. Like it happens just out of the blue. Why don't you be honest about what really happened in these games. Let me mock up an example of what actually goes on based on my own experience using myself as the rage quitter.
.....13 minutes in, the score 4-17
Me: lets ff at 15 guys this is over.
P1: stfu just play.
Me: Play for what? We cant win. You guys are just feeding. Why waste the time?
P2: We scale. Win win late.
Me: They have a 5-0 Yi, a 5-0 Vayne and a 6-0 Veigar. We don't outscale them and we have no cc except our Shaco support who is feeding hard.
P3: I'm not gonna ff this is ranked
Me: So?
P3: I don't surrender in ranked.
Me: But we aren't going to win
P3: Throws happen all the time.
P1: Just fuckin play and stfu. Why play ranked if you're gonna quit like a baby. Uninstall noob
Me: Dude why are you being an asshole. This game is over and I would rather not waste the time. Why are you forcing me to waste my time.
.....23 minutes in, the score 6-29
Me: Can we ff now? I tried for 10 minutes and we've made no progress
P1: We are not surrendering.
P3: We can win this. Just believe
Me: Seriously? Just believe? They have a 13-3 Veigar and that's your plan...belief?
P1: (All chat) Report our top toxic please x9 this noob
Me: Wow. I'm toxic for wanting to ff an unwinnable game where we have no chance.
P1: You been crying all game. Instead of just trying to win.
Me: I've been trying for 23 minutes and all we have accomplished is give to Veigar more gold.
P1: Then you suck.
Me: I'm 2-4, you're 3-11
Me: You know what. Fuck this. You guys can waste your time. I'm gone.
Me: (Disconnects from game)
This is very typical of games I end up leaving. Something like this is more likely what happened in those games. You guys need to learn when to accept a loss and stop expecting people to want to waste their time in trash games.