I agree that there could be some price pressure due to increased competition and choices. However, given the inherent differences between iOS and OS X apps, I

I agree that there could be some price pressure due to increased competition and choices. However, given the inherent differences between iOS and OS X apps, I don't see many iOS developers being able to instantly compete with the established independent Mac developers and companies (e.g. Panic, Omni Group, etc.). The years of experience of the established Mac developers shows through in their quality. If anything, they may need to alter their marketing a bit to justify the premium pricing.