When accumulating Bitcoin let it be with what we let go that's the money we can afford to loss, your statement is indirectly saying that an investor can invest with the amount he/she can't afford to lose and such act can be seen as trading.

In bitcoin investment the amount of money you can afford to loss is what is called discretionary income it is from your discretionary income you can make purchases or you can use in accumulating Bitcoin for it is the money you can do away with for that is your leftover income, so Investing with what you can't afford to loss can be problematic even to your health and bitcoin investment.