Would you ever consider adding some extra kinds of mercenaries that have other bonuses than the pillaging one? Like a Swiss guard unit that has improved combat strength in friendly territory? Since the policy is in commerce it makes sense for trade civs like Venice to have mercenaries but those same civs generally aren't raiding and declaring offensive wars

UPDATE v600: Extra Maintenance Cost has been reduced slightly.

Just noticed the maintenance cost for these mercenary units - 15 gold per turn for a PMC OUCH
Purchase price is fine But unless your civ is Very wealthy dreams of a mercenary army are over.