That's only the start. As soon as you've united Greece and built up a decent economy (read:
mines, ports, paved roads, also healers and of course markets) with taxes set to maximum, you'll swim in money. I'd advise you to spend it on even more buildings and queue them up, otherwise your governors will become horribly corrupt.
At one point this became a serious problem in my Makedonia campaign (even before 240 BC), so I took a million mnai and bribed some settlements.
EB's building options are far more expansive than Vanilla RTW's, which means you can make insane amounts of money once you've teched up. Rome, Carthage and Pahlava are best for this.
Right now I (Rome) am holding Italy, Iberia, and the Mediterranean islands, making
50k per turn. Do you know just how difficult it is to spend all that money? Man, I wish I had these issues in real life...