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I want to preface this response with the acknowledgement that we aren't the solution for everyone :) I just wanted to address the reasoning behind our services and how dependable they are.
The idea behind appMobi is to get out of the platform specific code. One code base should be all you need to go everywhere. At appMobi we make this our top priority to let developers get to the most platforms from one code base. Our services reflect that sentiment.
Game Center is iOS specific. playMobi is a badge/leaderboard system that allows your users to compete from different devices and platforms onto one scoreboard. So Kindle users and iPhone users can compete against each other. It also makes the cross platform saves seem more seamless as the leaderboard doesn't have to change between devices (if you want platform specific leaderboards, you can make them also with playMobi). The code doesn't change, you write it once and the leaderboards/badges work everywhere. HTML5!
We suggest you use 1Touch because when you build for iOS, 1Touch uses the native iPhone purchase system. Then when you build for Android, it uses the native Android payment system. You only integrate with 1touch then in our build system we recognize what platform we are on and make it integrate with the native payment system for that platform so the user is non the wiser. So again, you write once and we take care of the rest.
In your development,our services may not be for you, but push messaging,IAP system, and analytics simply do statistically increase user engagement and profit. Again, if you don't want to use them, appMobi is completely free to deploy your game with!
As for our platform's reliability, all of our services are distributed through Amazon S3, so unless Amazon's servers go down (which would effect MANY companies), we'll always be up and running.
I think you're idea for a "Pro account" is a good one and I'll send that up the ladder to see if that's something we'd have the resources to do.
This is a great discussion and I'm really excited to see r100 come out with full DC support. It's awesome to see that the Construct 2 community is full of passionate developers itching to prove that HTML5 is a game changer.(PUNS!)
Cheers,
Tyler