Probably because that's a foolish approach as a developer. If your app is worth a damn, then preventing it's use by potential customers simply because of your personal opinion is fairly inconsiderate. Should someone be deprived the use of an app simply because they bought a different phone then the one I approve of?
That's a hard line to take, I understand, and realize not everyone will agree with that. =) I just feel that from the customer perspective, the only thing that matters is the developer. And if the developer choose not to release on the platform I am using, then the developer is essentially telling me I do not matter.
