i think it is, because in the year 2011 you can buy a Bitcoin for only 4$ and if you buy 100 Bitcoin before and you still have it now , then you are a millionaire , and if you buy bitcoin now it's late, because the price of BTC now is expensive
Even bitcoin now is very expensive is not to late to buy bitcoin to have a profit someday, as we can see if you hold bitcoin in the fast year you can say that you have a good income right? because bitcoin price is very miraculos, because bitcoin price sometimes got multify in a short of time, so there are many people has the opportunity to earn more many in simple way of investing like holding bitcoin.