Are there any actual professionals here?

A couple of years ago someone in the UK did a study of how important formal training is for an actor as opposed to other things. They took as their sample all the Actors who had been knighted, and found that roughly half had been fomrally trained, the other half had learned "on-the-job". So, tell me... Why is the waiter who studied at RADA and hasn't had a paid gig since graduating more of a professional than the never formally trained actor who is rarely out of work?! I know fully trained people who don't know jack, and people who have never trained that know more about the craft than I will ever know!