Modding the unit costs to make battles epic

[Scorpion]

I´ve noticed that it is very rare to get to fight the promised battles of thousands versus thousands in the campaign. The AI tends to divide its forces, but maybe there´s still not enough troops to go around? I´ve been thinking about halving the unit costs, but I´m not sure how the AI would react to that.

Do the AI factions have an honest budget, ie. do they play with the same monetary limitations as player-controlled factions? Meaning, with lower unit costs, would they build twice as many units?

It might be necessary to halve the costs of other things too to keep it all in scale.