I've just been giving zGALI some thought...

Can anyone explain why there is a fee to transfer GALI into zGALI, but not the other way round? Perhaps it is to ensure that you are making a conscious, considered decision when going down the privacy route?

Also, going back to when zerocoin was activated, why is it that there had/have to be a certain number of zGALI minted/on the network before you could/can exchange zGALI back to GALI?

Simple answers please otherwise I won't understand (as you can probably tell from the wording/nature of my questions!).