High-Elo Players in Low-Elo Smurfs
This is a topic that is consistently brought up in the forums I've noticed. And there's a lot of good reason behind it.
In ranked, you expect to go against players with your relative skill level. If you're Bronze V, you expect to go against Bronze V. If you're Diamond I, you expect to be against Diamond I. But in the former, you'll see a lot of smurfs just in the game to have an easier time playing or to mess around. I just got out of my Silver V promos, and the last game was lost because of a smurf. They openly admitted to smurfing and said they were duo boosting (which is another discussion, but apparently that is allowed also). So in that Silver V game, we have a higher elo player, with their higher skill level, going against the lower elo players who really can't do anything against them.
High-Elo players on the Low-Elo smurfs are damaging to the ranked effects on the game. Yes, if we had been better we might have beaten that smurf, but that's not the point, we were supposed to be playing against Silver V not Diamond. Our skill level was put into a drastically different matchup, and there was no way we could win against that. This IS a problem in the game, and while you can't stop all smurfs because seriously its understandable someone wants a second account, Riot should have a way of protecting Low-Elo players from this. It breaks the ranking system and is just unhealthy for progression in the game.
In my previous example the smurf very literally sent us all a link at the end of the game and said "stop qqing and buy the boost". So we have all the evidence we need, there's no way this guy isn't a smurf booster. It should have been as easy as that. But no. For some reason this is allowed. And this is a very real problem whether people want to admit it or not.