$80 on apps? I didn't think it was that much, but after going over estimates in my head, that sounds about right, actually. A survey of 1200 App Store customers estimates that we've spent about $80 on applications so far, with an average of about 65 applications per customer. There's a little weirdness in those figures though: they also say that 65% of the apps downloaded were free, and that the average app price was $1.56. There's some extra information hidden in there: if 65% of the apps are $0, and the average price is still up above $1, that means people are spending way more than $1 on the apps that they do buy. More research seems needed there.
There's another surprising figure as well: of all the 1200 customers surveyed, altogether they only had about 15,000 unique apps on their iPhones. When you compare that to the latest figures of about 65,000 apps, that means you've got about 50,000 apps (definitely the majority) that are completely untouched by these customers. Of course, 1200 is a tiny sample when you're talking about the millions of iPhones sold overall, but if that is in fact a representative sample, that means that there are many, many more apps than people have actually downloaded and tried in iTunes.
Not hard to believe -- with iPhone developer numbers in the hundreds of thousands, tons of trashware on the store, and the relative ease it takes to crank out an app, it's no surprise that you've got way more apps than people interested in trying them. But then again, isn't that the way we want it?