Obviously the cost to maintain starbases introduces a new twist. If you go out and grab every resource you can find early on, you'll find yourself short of credits for your up-and-coming fleet's maintenance.
However when you examine each base's details the maintenance charge is listed as 0 bc. Whether you're simply paying a fixed charge per base (it seems to be set at 10 bc each at the moment) or a sliding fee depending on just how outfitted it is, it would be nice to see the figure there as well as on the budget

I know this may just be one of those things that's on the to-do list, but I didn't see any mention of it yet in this forum.