>Are you willing to spend 27% more for everything to use Apple payment gateway? Do you love it that much?
Most in-App purchases are in the range of 1-5$. If I pay a couple of cents more to have a unified experience, yeah sure.
It'd be interesting to see how much users spend on in-App purchases. For me it's almost nothing, maybe 1 purchase a year? The big money is probably in the free2play market where players spend a lot to buy booster packs or "gold".