If you have a bunch of alt accounts make sure you log in and open the free crystals you get... In this way, that account will participate in the event; therefore, if everyone does that, your main account might get better rewards because tiers are % based. To explain what I am saying more simply. If 100 people participate in something 1% of 100 is 1 but if 1000 participates 1% becomes 10 people so more people participate with low points it increases your chance to get better rewards on your main account.