Excellent question! The dinarim chest is a very unique element of the platform. It is your "key" to unlock the many chessed opportunities in the RWI store. The reason why the chest opens every 24 hours is so that you will come back to Torah Live and hopefully learn more every single day! The other more deeper reason is that we want to delay the need for instant gratification. If we were to unload endless dinarim on the user, the user would eventually not appreciate it and perhaps even ignore it. Now that the user has to wait and see how the dinarim count grows day by day, the user will have greater appreciation and more careful calculation on how they want to use those special dinarim in the RWI store.