I looked up Bitcoin cash's value, it topped above $700 in August, currently ~321, so it didn't double one's holding. Nevertheless, a well timed exit would have given some extra profits. Still, it is interesting that after the fork, the value of the forked currencies are more than the previous value of the lone currency... It is like a miracle, money giving birth to more money, while increasing the supply. I think I saw similar action last time with Tesla stocks.