1. The definition of "rich". I've responded here that I mean a level of comfort that is better than 99% of the rest of the world. Not necessarily millions of dollars.
2. Yes, a large percentage of millionaires are self-made... But were they self-made thousand-aires? Or did they earn the seed capital they started their businesses with? There are no doubt, those that had not a penny to their name but went and started collecting cans for the refund and used that to invest into a food cart or something... But I think most of those self-made people were able to create their businesses because they had a certain level of comfort that could be defined as rich to most in the world. (ie, if you even have access to get a loan for $100k to start a business, you're rich compared to a huge part of the world population.)