I see. I would agree that radar is more valuable than AIS, but when you have Radar and AIS on the right chartplotter it gives you MARPA capability far beyond what Radar alone does.
See a target out there... mark it... AIS info gets logged and your system predicts it's bearing and intercept. Click it and you can see his actual course and speed. It's pretty cool when you see it working. Especially when you're in fog and the slowest boat out there.