Does the 17 million include those iPhones still sat on retailers shelves. And does the 800 million include iTune tunes?
I could spout some amazing statistics about my own business, like the number of business inquiries I received today. But if I mentioned that more than half were cold call sales and marketing, the figures wouldn't look half as good. Me = as skeptical as ever ;-)
Although I could do with more work... I resist the urge to spam my business website.