Maybe they just wanted to save money. At any rate, these stats are really more of a novelty. We already know that most iPhone and Apple product users tend to be male, older, and affluent; it's not surprising that pastimes and activities that also appeal to that segment are popular among iPhone owners.
In the end, the most interesting stat may be the last one: iPhone owners are 52% more likely than other people to want to "wow" others with their devices. We know that iPhone owners have more money and more resources than others, but I'm interested to know more about just how vain we are and how Apple cultivates its own image to target that audience.