Talk:League system/@comment-4977390-20131119175932/@comment-3097946-20131119193446

There is also League Points inactivity decay over time, by a set amount, if you haven't played ranked in 28 days. It decays per the set amount every 7 days afterwards until you play a ranked game. The amount of LP that you lose per decay period depends on the tier that you're in:
 * Bronze - 0
 * Silver - 10
 * Gold - 25
 * Platinum - 35
 * Diamond - 50

You obviously missed this part while reading. You don't lose points while you're in Bronze. You can be considered inactive, but you can't decay all the way to Bronze V.