What the Captain said.
Wot No Engines, from my perspective, you have completely missed the point of these broadcasts, as has Dick and others. If somebody makes a broadcast, you obviously start looking, if he is close. But far more important, because I will probably not be able to see him initially, is to use the info he gave to keep myself away from him, until we pass (whether using visual manoeuvring to avoid or not).
This could well be overkill if you are in your two bugsmashers (listening to your idevices, tapping on your ipads) and if I was well away from a proper airfield I wouldn't bother. 172 to 172 head-on not a big issue, unalerted see and Avoid. If they collide, a few posters here would say "so what; it was low risk but it happened, that's tough, move along"...
Cream a jet approaching the circuit because some selfish fool wanted either zero radio participation or a Class D tower in accordance with ICAO airspace, and there would be a justifiable uproar. Because some wally sitting in Brussels created alphabet airspace doesn't mean it's right or safe.
Some people just don't get it.