That's about right at the moment. Actually a bit on the low side if we assume Backflip is using a yield optimization tool and working with every ad network the

That's about right at the moment. Actually a bit on the low side if we assume Backflip is using a yield optimization tool and working with every ad network they possibly can. Since ad networks always show their highest-paying ads first (this optimizes revenue for them, too), showing a user one ad each from five different networks is a hell of a lot more effective than showing five ads from one network. Cuts down on blanks, too.