Don't you love low priority queue?!
It's awesome when I never dodge or leave games, but the one time my internet decides to shutdown when I'm in champ select I get a leaver buster and get placed in low priority queue and have to wait 20 minutes to queue for 5 games. I have to wait a total of 100 minutes in order to play 5 games. That's really irritating when you have 4 other people waiting on you. There's no use in giving people longer wait times to play a game if they leave once. Give a different penalty. Maybe give a chat ban for leavers, or a certain amount of games vs bots, or something other than waiting to play. It doesn't change anything for anyone when you have to wait longer. People want to play the game, that's why they play in the first place.