It seems to me that Android is the next Nokia. Large market share but like Nokia their marketshare is almost worthless since Android users dont spend as much money as iOS users. At least that's what everybody's saying.
I think we're taking slightly different lessons from that post.
iOS = $5914, Android and iOS = $10342.08
Between the question of statistical significance and the vagaries of mobile app promotion and discovery, it's hard to say that one clearly pays better. However, both usually pays more if one is paying well, so it would often pay to support both as soon as it is practical to do so.
Given the population numbers presented above it does imply that individual Android users spend considerably less. There is a huge pool of them so the income is similar, but paying customers are harder to find in that huge pool of users. This means that Android devs may encounter the "app store roulette" phenomenon in spades; those apps that have a viable customer acquisition strategy will do well and the long-tail of Android devs will gain far less.
His summary: Android=$4428.08, iOS=$5914 (over the same time period)
So it is true that Android users spent less, but not by a huge amount.