How about an ingame feature, whenever you click on the gold / elixir / DE bar (top right hand side of the screen) to show how much gold/hr , elixir/hr , and DE/hr you're getting from collectors. Also it'd be nice to see if you're boosting those collectors ... ie 4/6 collectors x2 to reflect that 4 collectors being boosted.
So in essence, a nice little economy popupmenu type of thing to show you the resources gained per hour.
