Market Masters: Why didn't the book writers on the stock market and trading become millionaires as they seem to know all?

EWATSS® Elliott Wave Analysis and Trade Selection Trading System

First of all, you do not personally know how well off such writers are; hence you can’t make a sweeping statement like this;
It is like saying that all great coaches ought to be great players themselves also. History shows it is not necessary;
Many of such writers operate at the highest ‘Self Actualisation’ level in Maslow’s Hierarchy of Needs - where all the super achievers like Bill Gates, Warren Buffet etc. operate;
Many of such writers want to share their knowledge with others - as it will not reduce or affect their process of deriving riches from the markets while financially, psychologically and socially further enhancing them through their books etc.
While good analysis is mastery of observation, good trading is mastery of self - hence such writers can be greater writers than traders. There is no harm in benefitting from their knowledge as analysts and coaches;
Many of them teach (and they are excellent teachers) as they are aware there is often much more money in trading education than in trading per se.
Great and/or rich traders may often not have time or be interested in writing books or may be greater traders than writers.

Best wishes.

Market Masters