I'm assuming that the two figures in the top-right, being so closely related, are 'cached' in tandem: 732 backers, $2,569.56. 732 * 5 = 3660. 3660 - apple tax @ 30% = 2562. That gives $7.56 worth of 'top-ups' (no, I can't explain why that's such an odd number, unless the apple tax for in-app purchases isn't exactly 30%)
I have just checked the figures and the In-App-Purchases have earned $114.00 in profit so far. So it's not too bad, and we really appreciate that people have decided to support us enough to buy them.
I really like the idea, the look of the game, and the execution of the site. I'm in for the full $10.
I hope it does well, too. Our current chart position is #117 in paid iPad apps (ranked by number of downloads). Our current grossing chart position is #368 for iPad (i.e., Crabitron is the 368 highest earning app on iPad).
There is a massive discrepancy between these two charts because freemium games (i.e., games that allow consumers to spend as much as they want) can sit relatively low in the paid charts, but earn a lot more money from a stable user base.
Our current popularity is mostly due to being featured by Apple in their New and Noteworthy section. This will end in 5 or 6 days and sales will likely drop down to $100/day (instead of $1000+ per day). Games are extremely hit-driven, and have very unreliable sales curves.
With this trajectory in mind it is unlikely we will hit our development costs of $100,000. More realistically, we will see $20,000 before the game drops off completely in a few months.
It's still a pleasant amount to earn back for a side project, but it's definitely why we still work full-time for someone else, building things for clients.