A new app from my friends at Supertop:
Top Hat lives in the Yosemite menu bar and shows up-to-date daily sales figures for your apps. Revenue from In-App Purchases is aggregated to give you a single total for each app. Weekly figures can be inspected by holding ⌥ as you click the Top Hat icon.
This little one-off usually often come to iOS first, but the Mac menu bar is a great place for things like this. It really looks great.