[jandrese]

Isn't the idea that because your opponent spent resources on things like their first barracks and gas collector that your workers should outnumber them for the attack?

Of course you lose all of that time it takes for your workers to drive across the map, so it's a pretty dicey strategy. A 50% win rate against the AI sounds about right.

[she11c0de]

You shouldn't cut worker production at the beginning of the game - it's critical to keep pumping them uninterruptedly. You only build when you have enough resources to ensure that.