Because big players like professionals and istitutionals study the market for a very long time and when they decive what to do they have really to much money to buy or sell their positions in few days, so they have to sell for long time, weeks or months..thanks for the clarification. taking a closer look i see that professionals, privates, and institutions all favor BTC over ETH. Besides the technicals, why? Why do you predict that this trend will continue for "very long"? I'm really interested and not trying to be facetious.
check the duration of cycles of white and yellow players in the past you can see in the chart