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I will blame their poor knowledge here. In such a process temptation works. A person waits for a specified time or price to make a lump sum purchase despite having enough money. Many times they fail to buy. There is nothing wrong with waiting to buy a dip or a single buy, but it is not very efficient to grow your portfolio. There is a saying, "Slow but study, is a key of success". The DCA method fully conforms to this sentence. Not guaranteeing success in DCO but DCA method is most effective to grow your portfolio.
This is where the right approach is needed before taking action that can be detrimental to oneself, knowledge in investment becomes a light in the darkness so that they do not make mistakes in taking action. Failure in investment is caused by limited knowledge, waiting is not something effective, this is the same as making a large purchase at once. Instead of waiting or making a large purchase when they have enough money, they can make purchases periodically in an effort to reduce the risks associated with volatile price movements. This strategy can reduce the impact of volatility on large purchases, while also fostering disciplined investment habits that can benefit long-term portfolio growth.