Big companies don’t only make acquisitions to get a customer base, they also sometimes make acquisitions to get technology, yes often motivated by ownership of underlying patents but also sometimes to simply avoid developing something themselves and get what they need to market more quickly. The Roon exploration features and endpoint management would take Amazon time & effort for its existing dev teams to incorporate into an app especially given that from the sound of it the existing Amazon app needs more work to get even its existing functionality working better. In Amazon’s scheme of things buying Roon would probably be pocket change and might be worth it simply for the better app and the revenue opportunities that better discovery could give were Amazon to introduce an HD download store.