Is this news? Android users aren't worthless, but they are indeed worth less. On some apps I've heard of disparities as high as 15X - the value of an Android user being 1/15th that of an iOS user. On my own apps it's gone as high as 9X.

That said, as long as you understand the economics of each platform and ensure that your advertising expenditures and any incremental user costs are in line with the disparity, you should be fine. In my experience, the best strategy is to spend any advertising budget on iOS installs, and let word of mouth/viral features get free installs on Android.