Whats the fun in winning 15 LP just to lose 24?

This is the problem on my main account. I'm forever only allowed to win 15 LP and if I win 2 - 3 games in a row, I will lose it all in one game :|. Whats the point of playing a ranked match knowing that you are going to lose all of it in an instant due to someones mistake, afk's, trolling or other?
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