"Since player won't get gold until you kill one boss. It doesn't make sense to display a Gold/sec on UI. Most of time you will see 0 Gold/sec. Thanks for your feedback."
Look, it's still useful to know so that you can easily compare levels for farming. Gold/sec definitely makes sense in any incremental game. Is there some reason that you cannot show a projected gold per second gain for the level you are currently on?
 "Boss Must DIE!!"){kind=icon}