This idea is a waste of time, honestly I can see that your trying to make people spend some money out of their pockets, but some of them aren't that old to have a credit/debit/etc. close to concept. Based on this, people would run out of crystals be unable to earn crystals-when this happens they will go quit, create a new account, and so. If you want to add this ammo suggestion update, the amount of crystals earned from battles should raise and the amount of work you contributed to the team should get some, even if they didn't get a kill.