There is a topic of this in Feedback, but it's closed so I'll make a new one here.
Minerals would be for SC Armies
Gas would be for Pets
Credits would be for Store
When mods will fine people they will fine in all three money areas.
A three currency monetary system will be great. This will enable Trading like (IE: 10 mins for 10 credits).
The economy will grow thus games will also grow. It might become rigged though, like later on like 1 mins = 5 gas. THis will become a problem but not so big since people get money at same rate.
I really don't care if it's done or not, it's up to Yoshi.