If the game does well and they feel that there is a market on Android, then they will port it over. I don't think of it as we are getting screwed. Developers, ultimately, want to turn a profit, and until they think that there are enough devices that can run their high quality game, they probably won't develop for it at the same time as iOS.
I mean, read the forums for Angry Birds. Did you see how many problems people were having running it? Would you want to develop for a platform knowing that you are going to have to test it on a ton of different devices?