The gold/hour wont change at all, the more stars you have on a girl, the more gold she brings over a longer period of time. Its just for making it easier so you dont have to look back in the game every so often.
Outside of that with a ego of 5,6k and increasing while the arena as 2k max for me & me dealing 600 dmg/hit... I'm having such an easy time.
About to reach map 3, give me like 4 screens more or some..