The +50% Vault Purchases is a special Perk that is only available on Wednesdays.

While it is active, the contents of the Vault will be increased by 50%. For example, if there are 100,000,000 Coins in the Vault before the Perk begins, while the Perk is active there will be 150,000,000 Coins. Coins added while the Perk is active also see the same multiplier boost.

If the Vault is not purchased and the Perk ends, the Vault will lose the 50% increase.