You're absolutely correct In this aspect you don't need to invest with huge capital that you will find difficult to afford, all you need to do is starting up with a certain capital and rest assure the market may rise or drop at all costs so is left for the investor to keep an eye on your coin without having a shivering break sometimes you just have to overlook and be patient.
This is a wrong way to start up your investment. You don't just start up your investment with any money with you or a certain capital as you put it, nope. The money used to begin your investment or needed to start investing has a name, and it is called Discretionary income.. it is the money left and/or remaining after settlement of your basic needs, and that's the money you can use for investment and not just a certain capital just the way you sounded, because going by that statement of yours, someone might just decide to use some part or all his income to invest, and that is gonna be really problematic because when the demands that was not met arises, you might sell off your accumulated assets unplanned or even in loss.
So, the best is to handle of take care of your basic needs first, and then, we can allocate some of the funds remaining for your investment and some for building up our emergency funds and other back up funds