On the first matter. Yes, it makes perfect sense. Her books are superb, and very well written. The story flows great. She is an excellent writer _AND_ great at marketing.
Nothing ever stands alone and you generally need help from other people to achieve things. Her story is rags to riches -- if she can do it, literally anyone can do it. Was luck involved? Of course, to some extent. But hang out with the right people and you would be surprised at how much is possible in life. There is a reason why success often seems contagious.
On the second part: it's an effect from a capitalistic society. In fact, you can easily achieve the same returns (even higher) with lower capital. It's just that the outcome matters less: you can't live off of $100.
Have an open mind. $10m is literally one good idea away. Invested in Bitcoin in 2011? There you go. Made a great app in 2007? Maybe not $10m, but at least a few. Etc. Opportunities pop up all over the place -- most people are just not looking and too busy working a job and living life.
Literally everyone can make millions, IF that is what they desire and want to achieve in life. You just have to work towards it. Is it easy? Hell no. Should it be easy? Hell no.
Last: the elite isn't really keeping the wealth. They obviously won't just give it to you, but there are plenty of opportunities for people with good ideas but no money to team up with people who do have the money, and make something happen. And most will gladly share the gain.