[Lizard]

Some folks only use OmniFocus on iPad or iPhone. And we think that the best iPad UI is not the best possible iPhone UI and vice versa. So a la carte pricing serves our customers better than one app which is either higher priced or an awkward compromise between the iPhone and iPad apps.

That said, OmniFocus for iPhone does run pretty well on an iPad, so you may prefer to use that until we release an iOS7 recreation of OmniFocus for iPad.