OP you should understand that many so called early adopters (maybe most) aren't really so rich. No matter on what shitloads of  coins  they sit  initially.
In order  to  be rich  you  need  to put  into  risk almost all of  what  you  have(in terms of  fiat),  for a  certain period  of  time. No matter  what  kind of an investment. Just count persons  you  know, able  to  do  that.  How many  of  them  are so bold or  reckless, I ensure  you  not  many