@Lord_Scorpion34 You can buy up to 100 lvls with coins. I have come across maybe 1 or 2 leavers in last 2 seasons of ranked in Plat lobbies. And it stacks after 3 daily resets.
Don't take it the wrong way but your 'XP' suggestion is a half-measure, it has too many ifs and buts. It works but only to some extent. I would rather that leavers get timed out so others can play in peace.
I don't see any point to this debate so I will see my out of this discussion. We all have our minds made up.