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 agree with you that knowledge is very important, but we need to be objective here. There are a lot of smart people who are not rich. Most university professors have a lot of knowledge and are smart but are definitely not rich. The salary for the professors is very small for what they could be earning in industry jobs. Also there is a lot of rich families who are rich because their grand parents and so on. So there will also be some dumb people who are fairly rich.