Revenue is irrelevant. The question is how much profit iTunes draws in. I don't believe that Apple has ever released exact figures, but I've always heard that iTunes is a fairly low-margin business for them, so it's contributions to Apple's total profits are probably much lower than the contributions from the Mac business. Granted, the App Store may draw in much higher margins, but talking about revenue is still missing the point.

Yeah, I exaggerated. But out of $20.34 billion in revenue this quarter, that revenue is still a sliver. That sliver isn't going to lit Steve's eyes up and get him to go all crazy. You don't get Apple levels of success by acting shortsighted or stupid.