Same effect is seen in browsers, it is not uncommon for Safari users to have 50-100% higher conversion than the rest. The device choice ends up capturing different demographics (i.e. people who buy iPhones have more money to spend).

Some first-hand reports:

http://blog.monumentvalleygame.com/blog/2015/1/15/monument-v...

http://www.winterworks.de/bloo-kid-2-the-definitive-revenue-...