Starcraft is a game of economy... a lot of the same concepts that apply to economics in general can be applied (in some sense) to starcraft.
Things like investing for future returns (expanding, making addons for terran structures, etc.) and sunk costs in particular have been talked about a lot at various times.
Even the smallest donations help keep sc2sea running! All donations go towards helping our site run including our monthly server hosting fees and sc2sea sponsored community tournaments we host. Find out more here.