I didn't understand what you where talking about ... now I see - my quote.
I think that if I listed every local trainer in my community the majority of them are sadly incompetent. Do we have some good ones - yes. Are the good ones all famous - no. I don't think that you have to be famous to be good but I do think that you need to have learned your trade from someone that is good.
For the most part trainers run about without having any formal training or apprenticeship. I think when we compare to other vocations or trades that we will find when there is no formalized training then the outcomes are usually not very good. Lets take roofing for example. In Canada there is no need to get any apprenticeship training to become a roofer. So when you hire someone it is truly buyer beware and there are so many people scamming other people it is horrific. So I will stick to my earlier comment that most people that claim to be trainers are incompetent. I'm truly sorry if this offends you but it is not only my opinion but also my observations.