I made a little test. I made a race with +20% mineral mining bonus, 3000 racial points, default settings on galaxy.
Test 1:
Build 5 BSY (á 2 turns) at your home planet. Then every BSY starts making colonyships (á 5 turns on BSY). On turn 15, I had 6 planets, 4 colonyships on route and no minerals whatsoever. My mineral consumption was far too great and I had to shut down my BSY's. Upkeep costs too much.
Test2:
Build 2 BSY (á 2 turns) at your home planet and then start building colonyships (á 2 turns in planet). Then every BSY starts making colonyships (á 5 turns in BSY). On turn 15 I had 8 planets, 2 colonyships on route and resource consumption not too big. I can build on every planet.
Conclusion: Generally at first 2 BSY's on home planet is enough. Later build more if you like. And this is with mineral mining bonus. With no bonus at all, build only 1 BSY at start.
Prove me wrong.
