Buying on a dip is definitely a good idea but an investor cannot get advance information about when a dip will occur. And if he can't buy from the dip, his bitcoin portfolio won't grow. This means that this strategy will never be profitable for those who only want to increase their Bitcoin holdings by buying from the dip. If those investors do only DCA then they will have the opportunity to buy on the dip and continue their holdings even if the price of Bitcoin goes up slightly. This will increase their Bitcoin amount. A holder's main objective should be to increase the amount of Bitcoins so that he can build permanent assets in the long term.