I have no idea. You guys should test it but I think the Romans are discounted by... 20%? So I took about 8% of their total costs off which would be around 28K for 30K. I dunno, test it. My only concern would be that a lower mnai would over power factions like Getai or Sweboz that have dirt cheap ultra deadly units. But it would give skirmishing a purpose...

I would like to allow for viable skirmishers because they are key in stopping cavalry in heavy infantry factions but at higher budgets you have to buy for heavy infantry if the opponent does.