It is not all about money, it just looks like those people with fortunate life or those rich people became good at laws just because of knowledge and not of money. If you have good knowledge then there would be no problem in terms of that thing because knowledge is always the asset for every aspect of our lives.
I did not understand what you are trying to tell, someone who is an expert in law can be rich ? 
. There are two ways to make money, work hard and study hard and you can make a good career if not if you are smart enough then you will identify something that is required for the masses and if you can come up with a business then you can be successful. In both you need luck determination and hard work to be successful .