Why does Riot reset ranked ratings & honor on season start?

What is the reasoning behind this? It only gets annoying to those who have high honor and/or high ratings? And it only gets annoying to those who have low ratings, since placement matches, I imagine, are equally annoying for pr0s and n00bs alike, though for different reasons? N00bs might not actually find it fun to have to stomach getting REKT'd 10 times, pr0s may simply get unlucky a few times (especially since the MMR reset means they may get a n00b team while the enemy team has 5x pr0), thus mandating them a few weeks of unecessary grinding before they get to their appropriate hight elo.)
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