This method is no difference from buying aggressive when there is more money to spare. The only reason you are able to comfortably put 100% of your income into Bitcoin is because you have various source that you make money, and you don't rely on your monthly income to cover up for everything you need. Despite the general advice of not putting all our money into one asset you still choose to neglect because you feel it is less risky for you since you have no upcoming needs. But let me give you some reasons why this idea is wrong.
1. You are not expecting any needs, but life throw curveballs, things could go wrong like health and emergency need which you will need money for that is why it is important to keep reserve funds.
2. There could be a time where you might see a delay in receiving your income, thereby you need more money to survive and invest.
This your idea might seem logic to you, it's still a risky move to make. At least try to diversify instead of putting your entire money in one basket even if there is a huge assurance in that assets and even with a paycheck coming soon. Money that is not in your hand cannot be called you money unless you receive it.
Actually, what you say is quite confusing because we are here discussing bitcoin so why diversify assets if our goal is only to buy bitcoin. To be honest, the other points are correct but need to be corrected a little, if putting 100% of the money you have into investing in Bitcoin is certainly very risky because it will disrupt your living needs. So it's better to allocate 10% or 20% of your salary to invest in bitcoin.
We tend to see that everyone always experiences failure in their planned investments. Because their investment behavior is very aggressive by investing large amounts, but when their economic situation reverses, their decisions will have quite an influence on the course of the investments they make.