Part of the problem with the app store is a chilling effect - people don't even try to make controversial apps if they run a large risk of being blocked.
Perhaps you could look at the number of apps in Cydia, since the primary reason to put an app on Cydia is that it does something that would be blocked in the App store. I couldn't find an actual figure but simple searches on the Cydia store show > 35,000 results. I'd say that's much higher than the number of truly malicious Android apps that made it into Google's store and lasted any length of time there.
An oxymoron?
Part of the problem with the app store is a chilling effect - people don't even try to make controversial apps if they run a large risk of being blocked.
Perhaps you could look at the number of apps in Cydia, since the primary reason to put an app on Cydia is that it does something that would be blocked in the App store. I couldn't find an actual figure but simple searches on the Cydia store show > 35,000 results. I'd say that's much higher than the number of truly malicious Android apps that made it into Google's store and lasted any length of time there.