The starting vault size of 24 slots was one of those "features" that you often find in F2P games. Game publishers create a "pain point" by using forced scarcity in the hope that players will spend money expand their storage space. This is also why they scaled the expansion price to make the biggest expansion the most cost effective one, Microsoft was hoping that lots of players would spent the money for 1000 EP so they could buy the 48 slot expansion rather then buying the less cost effective expansions. Since this is no longer a commercial title, there's no longer a compelling reason to limit the starting vault size to 24 slots. The small vault size causes a lot of churn, having to log in & out too frequently in order to swap things around between the various civs. This isn't an issue later in the game, when a player with multiple Lvl 40 civs can earn EP's quickly. But for a new player, and especially for a player with previous experience at the game, who is much more likely to level up multiple civilizations simultaneously and therefore do a lot of transferring of materials and gear, 24 slots is just a pain in the neck. My suggestion is to start the game with 48 slots, which would remove the need for players to constantly juggle space in the vault and would significantly reduce the amount of civ swapping that takes place when you're leveling up multiple civ's.