It completely depends on the type of game you are playing.
If you're focusing on hero development, then rpg is going to be your income source.
If you've focused on city development, then you need economy to be your income source. I've had some games where I was pulling in 60gildar/season.
They both serve a purpose. Only thing is that in FE's current balance state, hero development is much easier. I think that will change more come next beta.
In addition, for early game, propaganda is increased to +2gildar/essence for the next beta. Will this make it a viable enchantment?
@ddd888: I know what you're saying with wanting a turn limit, but doing so would just encourage players to wait the first 50-100 turns before questing in order to obtain better drops.