Maybe you seems to have forgotten different countries has different currency and all currency doesn't have same value, you may come from a country which currency is very encouraging while accumulating your Bitcoin and there are also people who's currency are not encouraging.
All currency doesn't have to be equal before you can believe that anybody can accumulate Bitcoin, however if I'm not mistaken a lot of people who have a lot of Bitcoin today has a very lesser currency compare to some other countries and that was because they never allow any currency barriers on their Bitcoin investment, so actually if you think like those people you have yourself to realize that currency is nothing but a word which doesn't matter, meanwhile Bitcoin is like a tree with a lot of climbing branches and if you disregard to follow those branches in other for you to find your way at the top and be looking at how tall it is for you to climb, you will end up dwelling in fear of impossibility, so just follow the branches which is DCA and leave the price.