You're right for the fact that One chooses to invest in bitcoin using the DCA method does not mean that he/she does not have enough money to buy in bulk, of course if it is your first time of investing in bitcoin you will always want to play safe because is your first time of investing so you will always want to go with the amount you can easily afford so that even when you experience lose in the market is not going to affect you in anyway. I'm pretty sure that anyone who's new in this crypto space will always want to do the same, you can decide to buy in bulk when you finally understand how the market works.
In addition, investors must also have a higher level of patience in maintaining the investment assets that they have purchased without having the thought of immediately releasing the assets when there is an increase in price or correction in the price of Bitcoin which might cause panic in their own minds. One technical side of Bitcoin holding is that patience alone is not enough for you to hold successfully on the longer run, because at the end of the day, a source of income and an emergency funds is even more important than been patience because you might be forced to sell at a loss or even prematurely so as to address a pressing financial needs or an emergency like health issues, though patience is important, but patience alone is not enough to hold successfully, a source of income and an emergency funds are very much key in your ability to hold without tempering with it in the future.