Piracy is a reality. Nobody can stop it!
Anyway there's less piracy in mobiles than in PC ( PC is too much ).
Once mobile games are not expensive, there's still a good market for mobile games.
There's also other ways to pack games inside other products, if the game itself will not sell.
We need to learn different and creative ways to go to the market nowadays.
Anyway, the public that uses piracy today is a little different from the public that pays for games.
People that likes to play also wants to participate more on community and also wants support that the piracy can't provide.