It is never a good idea to pay developers to support a platform [1]. I struggle to find a single proof point of a successful platform where early dev adoption was kickstarted by the provider paying for apps.
All that paying for apps does is get uncommitted developers doing second-rate work. It sets the expectation that payments will continue as well.
I was bullish about ADN until I read this news. Now I fear it is doomed...
[1] http://ceklog.kindel.com/2012/09/26/paying-developers-is-a-b...