I, personally, believe that the platform has very little to do with that disparity of revenue at this point - but it is directly related to the demographic purchasing the phone. Android phones are often much easier to acquire with fewer financial resources. That is not the market Apple has targeted or has wanted to cater to in their quest to position themselves as a more premium brand. In some cases they may be and in others it is a marketing facade that people have bought into.
But, the reality is to deliver a good experience on Android isn't any harder than that same experience on Apple. Is it as financially rewarding? Probably not, again due to the difference in overall demographic of users. But I think it has very little to do with technical limitations or variances as described.