Why can't my Mac run iPhone apps?

When the iPhone opened the app store to third party developers and basically anyone who could afford the $99 SDK we we're all amazed at the enormous success. Thousands upon thousands of great apps have been launched transforming the mobile marketplace forever as it can now compete with laptops on the go. So, I ask, why the hell can't I run my apps on my mac?! I know that the iPhone OS, while based on OS X technology, isn't the same operating system. But as a consumer I don't care. Sure, most apps are just boiled down versions of larger applications for Mac or the web. But some of them are not, games especially are available only on the iPhone in that form.

Well I want to use some of them on my Mac! And it shouldn't be that hard, the SDK for developing apps can already emulate apps directly in OS X. But I want to run them from iTunes or, better yet, directly from my dock. I already own them and they're already stored on my Mac from constant syncing.

Please Apple, let me run my Apps on my Mac as well.

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