From basic economic principles, if you have a higher capital, you will certainly have higher returns compared to starting with a smaller capital. If you're just chasing returns or expecting a huge profit margin but pay slight attention to how much you use as your capital, even when you make a profit, the extent of your profit will largely depend on how much is your Capital.
REMEMBER
50% profit on $1000 is $500
5% profit on $100,000 is $5000
THE IMPLICATION IS;
Don't chase bigger returns, chase more capital. This is also applicable to How much you invest in Bitcoin and how much profit you can get from it.
I think you are looking at this the wrong way around. People who have little money have to take much higher risks in order to get the same returns as those investing with much more money. However when risk goes up, there chance you will walk away with less or even no money at the end gets higher. What you'll tend to find is that people with money have learned, through practice generally, to read risk better and even conserve their funds. They will often be encouraged to diversify by financial experts, so if they have a million they might have 500k in property, 400k in stocks and 100k in more risky assets which can balance out to give a reasonable return - but they know not to overstretch their resources.