I've had the same thought about socks. I've pondered starting a business around the idea -- pay $100 and we'd send you a few samples of different sock brands. Then choose the one you want most and we'll send you 30 pairs -- all you'll need!
Glad you liked my post! For the 45M figure, scroll down to 5:41 (or alternatively search the earnings call page for "App store in 77 countries, more than 45 million install base.")
Apple doesn't break out iPod Touch vs Traditional. So I used admob's numbers about the iTouch vs iPhone to arrive at the number of iPod Touch devices.
Yes, people outside the US buy apps :-P But it's useful to get a device penetration figure (8% of americans) and work with that to do market sizing for a vertical. You could obviously figure out the penetration figure broken down by each country, but that would be rather time consuming.
Thanks for the comments on my blog post guys. This 45M isn't the # of devices produced. It's Apple's own number about the install base of app world. So likely it takes into consideration broken phones and people upgrading.
Our team so far consists of an ex-youtube designer, an Oscar/Grammy/Golden Globe award winner, and me (co-founded Timehop, was a designer at Snapchat)
For the right senior person, this could be a late-stage cofounder CTO type amount of equity and responsibility too!
Description and contact info at: https://www.notion.so/Lead-iOS-Developer-ba18577b6ba44ad68e4...