As an example: artists often have this feeling that they need to stay "pure" to their air to make it. Yet, the best artists that often "make it" are actually businesspeople first and artists second. They will think about creating art that can and will sell.
Second to this is the fact that money generally ends up making more money. If I have $10m in the bank (a small amount of money in the grand scheme of things and looking at how much money goes around in the world), then on average, if invested properly, this should generate you about $1m in capital gains per year. Most people don't spend a million a year.
Add to that any income you might be making from whatever you're doing (entrepreneurial stuff, etc) and it's generally very hard to drop out of the elite once you're there.