I skimmed through a few pages of this thread, and I'm not sure I understand it. Correct me if I'm wrong, but this is how overlord saccing works:
I play Starcraft 2.
I play Zerg.
I have an income of 500 minerals per minute.
I build 16 zerglings every minute. That costs me 8*50 = 400 minerals every minute, and 8 supply every minute.
I have 100 minerals of income left, which I use to make the overlord which enables said zergling production.
This happens every minute.
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On minute 10, I build two overlords and sac one.
That means I only have 300 minerals to spend on zerglings, meaning I can only build 12 zerglings on minute 10. My supply, then, is two less than the maximum.
I spent an extra 100 minerals for scouting, and now I have four less zerglings.
I think this is what the OP is trying to get at by saying "minerals spent = 200". But the reason most people don't factor that in is because they have to make an overlord every minute anyway, so you've only effectively spent 100 minerals outside of your standard production cycle.
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