Yes, if rich people buy, they certainly have to buy too. If we have money, for example... if we don't, just be patient and wait until we get wages to buy. 
Buying BTC when the price is falling is a must for those who are already familiar with Bitcoin because they don't want to miss out on accumulating more Bitcoin. But if they use DCA to invest in Bitcoin, they won't pay much attention to the price. They'll simply focus on buying at specific times and then holding on. They won't be swayed by temptations like selling when the price rises, because their goal is long-term. They could have sold their Bitcoin at $122,000 yesterday, but those with long-term goals won't be tempted to sell. They'll hold on until their target is reached. But some people sell some of their Bitcoin to take advantage of their long-awaited gains, and that's not wrong either. They have their own plans, and they'll certainly be different.
Buying BTC when the price is falling is a must for those who are already familiar with Bitcoin because they don't want to miss out on accumulating more Bitcoin. But if they use DCA to invest in Bitcoin, they won't pay much attention to the price. They'll simply focus on buying at specific times and then holding on. They won't be swayed by temptations like selling when the price rises, because their goal is long-term. They could have sold their Bitcoin at $122,000 yesterday, but those with long-term goals won't be tempted to sell. They'll hold on until their target is reached. But some people sell some of their Bitcoin to take advantage of their long-awaited gains, and that's not wrong either. They have their own plans, and they'll certainly be different.
It is not mandatory to buy Bitcoin when the price of Bitcoin is low. Each person should buy it based on his financial situation. If a person sees a decline in the Bitcoin market and invests all his money, this is not the right decision at all. Because if that person does not buy based on his financial situation, then he is putting his holding at a very high risk. We can never say what will happen or what will happen in the future. If you need some money after you invest, then you will be forced to sell your holding. Then if your investment continues to fall, you will be forced to sell it. So always buy based on your financial situation
If a person's financial situation is good and if he has left money to buy during the decline after buying in the DCA method, then he can buy during the decline if he wants. But you have to take care that you do not need the amount of money you invest.