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 dropping is a good thing because we'll get a lot of BTC. However, I think buying when the price is rising is also fine, as long as we intend to hold it for the long term. In my opinion, buying BTC using any method is certainly a good idea because BTC certainly fluctuates, and we can certainly take advantage of those fluctuations. However, in BTC investing, I think the most difficult thing is the temptation when the price has risen high and we suddenly want to sell it. Of course, I think that temptation is sometimes difficult to resist. So, in essence, I think that temptation is difficult to overcome. Of course, currently, many people regret selling their BTC at prices like $70,000 or $100,000 because they thought it would drop again, when in fact it didn't. The point is, a strong intention to hold and retain BTC is certainly one of the keys to successful BTC investing.
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 dropping is a good thing because we'll get a lot of BTC. However, I think buying when the price is rising is also fine, as long as we intend to hold it for the long term. In my opinion, buying BTC using any method is certainly a good idea because BTC certainly fluctuates, and we can certainly take advantage of those fluctuations. However, in BTC investing, I think the most difficult thing is the temptation when the price has risen high and we suddenly want to sell it. Of course, I think that temptation is sometimes difficult to resist. So, in essence, I think that temptation is difficult to overcome. Of course, currently, many people regret selling their BTC at prices like $70,000 or $100,000 because they thought it would drop again, when in fact it didn't. The point is, a strong intention to hold and retain BTC is certainly one of the keys to successful BTC investing.
I don’t think buying BTC when the price is falling is considered as a must buy to those who are familiar with bitcoin especially for investors whose initial strategy is focused on the long term goal of accumulating consistently and hodl, as a matter of fact they don’t even tends to pay much attention to the market price, all what they care about is to consistently accumulate with their discretionary income no matter what the price is. And when the time to buy when the price is low presents itself, they only take it as an added bonus or advantage to make use of it to increase their level of accumulation and not a basis upon which they are investing with (buying the dips). As a bitcoin investor, knowing fully well that bitcoin investment is a long term investment, and at such your priority is to focus on consistently accumulating your bitcoin with your discretionary income either on weekly or monthly basis depending on how your income flows. With this, you don’t give priority to a must buy only when the price is falling. And gradually you’re building up your portfolio with your little by little and consistent accumulation and holding for the long term goal.