Neither necessary nor sufficient. It's easier to get that kind of money if you ware born into a small elite in a resource-rich and/or poverty stricken country.
Which is for the best, because then I likely would have ended up supporting Chelsea in the English Premier League.
[Edit] Further to pessimizer's reply below, but responding here so the thread doesn't disintegrate. Note that the only reason I raised "first world democracy" was because Alex raised how "privileged" I am. My "privilege" is where I was born, and that was in a first world democracy.
I think I completely agree with your point that being born where I was doesn't of necessity deliver me $15M or $30M, which is why I keep putting "privilege" in air quotes.
result of random google: http://www.huffingtonpost.ca/2012/06/12/countries-with-most-...
reply to edit: I'm trying to say that the privilege that makes you 15-30 million is something other than simply where you were born, not that it doesn't exist. That's why I'm not putting scare quotes around it. Being born in a kleptocracy if anything makes you more likely to have 15 million, rather than less.