A low-income earner can also invest in Bitcoin, but it should not be done by putting all their savings at once. In fact, even a high-income earner should avoid investing all their income in Bitcoin. The simple and most comfortable way, especially for someone with a low income, is to use the DCA method. With DCA, you buy Bitcoin either weekly or monthly, depending on the amount you set aside for continuous investment. At the same time, investment should be done with discretionary income, money you have left after paying your other needs, so you won’t be forced to sell your holdings in difficult times.
If you truly want to feel comfortable while investing in Bitcoin, it shouldn’t be done by putting all your income at once. But see it as a continuous process, whether the market is going up or down. This way, you won’t panic during price changes, but you will steadily accumulate Bitcoin over time.
It's unwise to invest in Bitcoin with our savings because that's not the right way to go about Bitcoin investment and any investor who indulge in such practice won't last long in Bitcoin investment since there's a big possibility we will use the money meant for our expenses to invest in Bitcoin, and when it's time for us to solve our expenses, we won't have enough money to take care of our expenses and we will completely depend on our Bitcoin investment to sort ourselves out. It's always wise we invest in Bitcoin with our discretionary income so that we will always be fit to solve our expenses, and it will help us to remain in the game for a very long time.
What kind of savings you mean like the one you put on the bank and let it earn few interest per annum? That set up is waste of time since we cannot get anything good profits for doing that.
Much better if you use it to invest on Bitcoin since there's a good chance that you can earn more better profit from doing this and transferring your savings to more better investment.
But if the money is intended for other good purposes like for emergency funds or basic or daily expenses well I would agree with you that we should never touch that amount since that money is intended for our needs and we might face some problems if we put everything we have on Bitcoin since we might fall short for doing that and our investment might fail especially if there's financial or other serious problem occur.