Solution to duos boosting

Since Riot's made it clear that as long as you're not sharing accounts, it's not punishable for a diamond player to boost a low ranking friend using a smurf account, we often encounter such players who ruin the spirit of the MMR/Rank system.

But with the new addition of ~infinite Summoner leveling, there's now a way to somewhat fix this issue. Since the lower-rank player would normally be using their main while their ally uses an account they recently leveled to 30 explicitly for this purpose, there could be a big LP penalty for players duo'd with someone with a high level difference. Something like a 50 or 60 level difference, so that it doesn't unfairly effect people who are just duoing with someone who hasn't played in a little while.

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Edit: I thought of a slight alteration that would further decrease the effect on legitimate duos; the level difference penalty would only come into effect if one of the accounts is below 50.