Not always. It also depends on weather the programmer actually wants to spend a lot of his/her time trying to fiddle with getting the app to run fine on all different OS combinations as opposed to adding new features. It's not the most fun part of the whole deal and can be frustrating at times.

Very true. I just wanted to bring up the economic aspect of this issue, as it was one of the main points in the announcement by Mika Mobile of dropping Android support for Battleheart, which I assume this piece is in response to.

http://mikamobile.blogspot.com/2012/03/our-future-with-andro...

They were spending 20% of their time supporting the Android port, while only getting 5% of their revenue from the platform.