I'm sure there were many failed business in this world although they started with big capital. The reason can be different from one business to other, but I think the most common reason is about failure in managing the capital wisely because of wrong plans and strategies while running the business. So I cant fully agree that the higher capital = the higher the returns, because there is no guarantee of profit in any kind of business. When a risk is involved, we should always aware that there is possibility to lose regardless how much our capital.
That's why before we spend a lot of capital on a business, the most important thing is that we must first learn how to manage a business correctly and on target, because it all has to start with knowledge, not just determination, there is an intention that we have to understand and the knowledge, then After that we can increase capital little by little, don't immediately spend a lot of capital at once.