Want to know how to get rich? Really, really rich? Maybe we could learn something from Blackstone (NYSE:BX) chief Stephen Schwarzman. He found himself at No. 73 of Forbes' list of the 400 richest Americans this year, with a net worth of $3.5 billion. Schwarzman managed to pull in a sweet $677 million when Blackstone went public earlier this year.

Among Steve's keys to financial success? Well, saving, of course! The New York Post reported Friday that -- according to a report by Contribute magazine -- the Schwarzman Charitable Foundation has total assets of a paltry $63,424, with just $991 set aside for charitable purposes. Since he's not throwing away all that hard-earned money on charity, imagine how much faster he's compounding his wealth!

If only we could get Microsoft's (NASDAQ:MSFT) Bill Gates and Berkshire Hathaway's (NYSE:BRK-A) (NYSE:BRK-B) Warren Buffett to understand this simple concept, maybe they, too, might stop frittering away their fortunes.

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Fool contributor Matt Koppenheffer does not own shares of any of the companies mentioned. You can visit Matt on The Fool's CAPS service here, or check out his blog here. Microsoft and Berkshire are Motley Fool Inside Value recommendations. Berkshire is also a Stock Advisor pick. The Fool's disclosure policy would happily retire if it made what Steve Schwarzman makes for just one year.