The "Vault - Lock/Unlock Chips Feature" wasnt just implemented for fun but for future use when you/we will be able to trade chips. Right now, there is indeed no point in doing so but I thought I would share with you that it`s not just a fun gimmick. 

Unlocking coins in the vault normally comes with a little delay before you will be able to claim your chips and sell them - this is to prevent too many people unlocking due to market fluctiuations.

Long story short: Chips will become tradeable sooner or later and that`s why this feature will be needed.