There's lots of cool stuff you could automate if you could provision OS X on demand. For example, you could offer an "iMessage proxy service" that proxies text

There's lots of cool stuff you could automate if you could provision OS X on demand. For example, you could offer an "iMessage proxy service" that proxies text messages it receives through your iMessage account by calling the iMessage app as a black box in the OS X instance. If you want to do this yourself, you can do it of course but your OS X will need to be running 24/7. Fwiw the same is true if you could virtualize iOS.