Why bother?
Nokia's Ovi store was an arse to begin with and it's stll an arse today. Most of the app revenue goes to the operators, the Finnish government (VAT) and Nokia, leaving the developer with less than 25%. Nokia has failed to rectify this problem and no amount of in-game/in-app billing will help. No developer in their right mind would touch Nokia....
Sorry guys, that's an F grade, please dawn you dunce hat and take your (regular) seat at the back of the classroom and for your homework tonight, look up the meaning of the word "competition". 25% revenue share is not the same as 70%.