I just wanted to take a second to address @0plus1's concerns:
We do support IAP. Please refer to http://www.appmobi.com/amdocs/lib/Article-1TouchInventory.pdf?r=8753
We do not support Game Center; playMobi is our solution that is meant to provide similar features in a cross-platform fashion. Please refer to http://www.appmobi.com/amdocs/lib/playMobiDeveloperManual.pdf?r=1848 . We also have a Scirra plugin already made that can be found here: http://playmobi.appmobi.com/files/scirra_playmobi_plugin.zip
We do not support iAds. We investigated them early on and it didn't seem like they would be a viable revenue stream for our users. If someone were to make a case otherwise, we would consider taking another look.
With regard to some of the other comments about flexibility and extensibility in this thread, we do support plugins. Please refer to http://www.appmobi.com/index.php?q=content/appmobi-plugin-architecture .
@0plus1 mentioned that there are a large number of pre-written phonegap plugins available; it shouldn't be too hard to take the source code for a phonegap plugin and port it to an appMobi plugin.
In short, we support IAP, we don't support iAds, we offer playMobi in place of GameCenter support and appMobi plugins enable user-defined extensions.