Why the Harmonic version of the Elliott Wave theory is much less known than the classic version proposed by R.N. Elliott?

The classic version of the Wave Principle was popularized by Robert Prechter who published a number of books refining findings of R.N.Elliott. This is because of his work the classic theory is well known and widely practiced. Ian Copsey, who proposed simple yet important modifications to the classic theory and called the modified version the “Harmonic Elliott Wave theory”never was that active in promoting his findings to the mass market of retail investors.