http://www.imagebroker.net doesn't sell directly to customers but to stock sites. They accept RF and editorial with a long shelf life (not news photos). As far ask I can see, they are not connected to the major RF stock sites, but they ask not to upload images that one directly uploads to its partner stock sites (e.g. bildmaschine).

You need to send them 30 high quality images and then they decide about your acceptance as a partner. The commission is 60%.

Anybody working with them? What's the yield?