Easy Money:
If you're low on money, go to any arena. Save, then temporarily recruit one of the gladiators (the one that looks like he has the most expensive equipment). Then go out to the map and walk around on the grassy areas (or the sandy for the southern expans) untill you get into a fight. Then put in the temporary recruit and whoever else you want to put in. Put the recruit as close to the enemy as possible. Then put whoever else as far away as possible. Let the temporary recruit get killed then go with someone else and get the chest he left. Then you can chose to leave or kill the rest. Then go to any shop and sell whatever you got. Enjoy.