Not to turn in Captain Killjoy Statistics Man, but this is a prime use-case for comparing mean vs median vs mode. What if the vast majority of folks spend $0, but there's a few Clash and Clans and Pokemon Go whales out there skewing everything? Recently, we saw how few people actually paid for Super Mario Run (something like 10%?)
Seeing the median value as compared to the mean would go a long way to describing the actual spending habits of iPhone users, rather than this semi-meaningless statistic. (Except that it shows Apple makes a large amount of money)