Immense wealth *does* give people huge advantage in making more money, often in ways that are 'unfair', or about monopoly. But I don't think this is a good example.
First, there's no 'leverage' here really. Leverage is getting multiplier effects for a dollar.
For example, if your broker lets you buy stock not just with the money you have, but allows you to buy $2 or $3 or $10 per dollar in your account, betting that you won't lose too much and can repay, you can invest much more money, and make far more money - if you make money. Wall Street firms do the same, making investments risking money in amounts much more than they have.
In recent years, they have successfully lobbied to get the government to relax restrictions and allow them to have more leverage - which causes risk to the economy. FDR set up a lot of financial regulation that limited the abuses by investors and banks that could be very profitable for them but hurt the country. The last 30 years have been an attack by the financial industry on the regulations that have played a big part in the increasing financial crises (and Wall Street's taking 40% of all profit in the economy rather than the normal 10-15%.) As they make more money, they can lobby more.
While your specific example doesn't fit what happens, you are right that big money does have a lot of ways to help the rich, e.g., 'Barrier to entry' was mentioned above.