ORIGINAL: Tcby
Point three is correct. Point 2 is..somewhat correct. Number 1 is incorrect.
The issue is not simply fuel related. If you have a starport (or more specifically, any base with construction yards), then the private sector will make sure that there are enough resources at that port to build large amounts of ships. Basically, they send a certain amount of all strategic resources to that base so that it won't immediately stall due to resources shortages when you issue a build order.
Players avoid building starports for this reason; it is easier to manage resources when the private sector isn't trying to spread them evenly across multiple locations. Also, its a pretty big deal that you can only build Bakuras is one location.
Thanks for correcting me, but unfortunately I am still confused.
1. I cannot find a definition of exactly what a commerce centre does, Jeeves' economy guide doesn't mention them.
2. If a commerce centre simply buffs trade by x% then the real question is what defines trade on a planet and how do you determine how much it is?
3. From what you say fuel is distributed to all bases, whether starport, star base or defence platform?
4. The basic rule of thumb is if you don't want to build ships at a planet, don't build a starport?
The main issues I'm trying to figure out around this question at the moment are these:
A. I always seem to have enough resources to build ships at HW (where I have the Bakarus) but the LSP there is always running out of fuel to fill up new ships, and most other starports run out of it as well when I'm running military campaigns. I want to fix that somehow.
B. I am struggling to figure out the trigger point to build a star base/defense platform on planets, or how to design them, that I don't want to build a starport on. I get the happiness bonuses from rec/med when I want to tax the colony, but i can't understand the benefits you get from a commerce centre or how to gauge how many docks are required for a planet etc.