Maintaining a surplus is often considered sub-optimal play; if you aren't dipping into negative income to hire stronger units, you aren't clearing shards fast enough to keep up with AI progression. RPG Elements and Hero Customization
Units gain experience and level up individually. Losing a high-level unit can be devastating, as their veterancy bonuses often outweigh raw stats. Eador: Imperium
You play as an "Astral," a god-like being competing with others to conquer these shards. Maintaining a surplus is often considered sub-optimal play;