I don't think those figures accuretly convay how good that game is, it's just there arent that many games to choose from or compete with yet. Every one will be rushing to make iphone games now and the market will become saturated. These people making big money simply got there first, and in my opinion that ship is already sailing.
It doesn't, but it shows that there's a market for small development teams to push out great games and actually getting them out to people without having to come up with a ton of financial backing first - which is awesome. So, I don't see where this ship should sail. I don't think it's a good idea to quickly create crappy games just to make a quick buck, but I do love what Apple has done for indie developers.
I think what we'll see in the future now is that all those crappy iPhone games that aren't even worth 2 dollars will quickly fade away, because there will be a ton of great games that actually are well produced and are a lot of fun and they'll be created by teams of 3-5 people instead of 15-30 people, which actually marks a paradigm change when it comes to game development.
Personally, I hate how we split the market right now, with casual (read: shitty, "basic" games that you could also play through flash in your webbrowser) and hardcore (read: "play it safe" productions, sequels, big budgets, etc.) games - We can now do simpler stuff in shorter timeframes and focus on core gameplay issues that weren't fixed in the hardcore department yet cause it would've been too risky to experiment. We can experiment more with story and gameplay and even release small games as prototypes to bigger productions, just to see how people would like this or that direction. And all of that is pretty exciting.