-snip- the very worst part is when we see the coins that we wanted to invest is rising.Rich people can't feel this pain and i am sure that they cant relate this problem about money.
Why is it a problem? One can start investing with accumulation or DCA and start buying in small amounts according to their budget. No need to wait until you have a lot of money just to invest, just start buying in an amount that suits your budget and do it consistently until your goal is achieved. Because now many investors regret not buying from the start just because they saw the price of Bitcoin was high, even though it was affordable if they bought in smaller amounts.
DCA helps you accumulate amount coins with time but your return is still 100% what the coins do later in the future and what you still invested matters as well. The main purpose of DCA helps you to buy at any given price and not necessary if you have the money at that point in time or not. Imagine that you did spend $2k to buy ethereum using DCA and ethereum has only did 50% yearly move, you wouldn't have same profit with another person that did spend $100k on his investment.
The most important of them is that you whether you have large amount of money or small amount of money, whatever you are buying or doing DCA with, don't do it with one coins, diversify your portfolio so that your story will looks similar to that guy that bought $17 worth of Pnut that turns to $3 millions after Binance listing. This is because you never can tell which of the coin is going to blast off with berries of profits.