How iPhone apps are like McDonalds hamburgers.
technologizer.com
technologizer.com
By your example, somewhere beyond "billions and billions".
The U.S. seems to do the same thing with our deficit. It's over $13 Trillion USD, and yet they don't put that under every government office sign.
At some point, numbers seem to get just too big to matter to people. Kind of like Richie Rich and all of the jewels and jewelry all over his estate. It was just there. It didn't matter.
BTW- Richie Rich is back. "The first new Richie Rich comic should hit retail in early 2011.": http://www.icv2.com/articles/news/18545.html
What happened is the marketing message changed. No longer does McDonalds need to prove that they are legitimate fast food vendor by telling everyone "hey - we've sold a lot of hamburgers!". If anything, they're now trying to gloss over the notion that they stamp out 2 million of these uninspired little blobs every hour.
The consumer climate has changed and now "billions served" doesn't sound nearly as impressive as "we handmade this one for you".