The Android platform offers a broad range of possible devices. There's a plethora of low end devices that account for almost no purchases. If you're looking anecdotally, more developers are likely to have high-end androids (i.e. people you're likely to see). Those aren't representative of the android demographic as a whole, which is less likely to pay for apps.
Not weak at all. There's a bias on the Android platform to the top games (or apps). It's probably not surprising at all that a top app would do well there. But overall the platform is less lucrative for the majority of developers.
There's several reasons why there's less developers focusing on Android. One of the biggest is the way the Android Marketplace updates their most popular app lists. The list changes much less frequently than iOS. With an overall bias of all users towards checking out apps on the top list, it's just more difficult to get seen on Android. Beyond that, there's less demand for apps outside the top 10 list on Android. Big app companies will continue to support the platform. Indie developers will continue to make it less of a priority since they don't make as much money there.
It's obvious you're an Android supporter. There's nothing wrong with that. There's a lot to like about the platform. If someone's criteria for a tablet is access to lots of high quality apps, Android is not the platform for them. There's a reason Disney chose to support iOS for their new Cars interactive app. That's where the majority of the money is for developers, and where most developers will focus, for at least the near term.
