The Acoustic Energy box uses a website at
www.reciva.com to acquire stations. Unlike many Wifi radios, there is no subscription and you can add stations of your own to the site's database. As I understand it, Reciva make the module used inside the Acoustic Energy radio, so I guess the high price of the unit is to cover the running of the Reciva stations service.
I notice that Acoustic Energy mention (on their website) the possible future addition of other subscription services.
There is an offering from the German firm Terratec, called Noxon. To download stations, this uses a site on which only some of the content is for free - some stations are based on subscription. I think this is the approach used by others like Netgear, DLINK, etc.