More than 1 million users bought PAID version of fruit ninja for Android. Let me tell you what halfbrick did: no updates for 1-2 years. I really hate halfbrick..
Odd, because I've read of several updates to the Android version going back to at least a year ago. What I see available for Android seems similar to my iPad version. In fact, if memory serves it almost seems like those updates arrived about the same time as the iOS version.
Not like the updates offered much of substance anyway. The most noteworthy thing I noticed was a ton of ad spam. Fruit Ninja is entertaining, but like Angry Birds, it's incredibly overrated.
I don't want to go out of my way to defend these developers. I don't know anything about what's going on behind the scenes in this particular case. However, I do have friends in the industry and the whole process is far from trivial. It's not just a matter of whipping together some update. And sometimes the problem is a lot more complex than simply selling a successful game. Halfbrick might find trying to support a million different Android devices just not worth the effort, especially since they've got a cash cow in iOS. I personally know of a developer who's been incredibly successful with Xbox Live who's refusing to develop for the platform ever again because of the crap Microsoft has put them through.
And it's not like these developers owe us anything. What do people expect from games that cost them a dollar or two? People used to be okay with paying upwards of $40 for a game with comparable gameplay in a time when no one even dreamed of updates.