In the hedge fund business, there are many who can post a few years of strong gains. But how many can beat the averages for three decades?

Well, it's a rare feat. And, it means you'll be a billionaire.

This has been the case with James Simons, who is the leader of Renaissance Technologies. However, according to a recent letter to investors, he plans to retire by the end of the year. He is 71 years old.

Over the past couple years, Simons has been loosening the reins at the firm, so as to provide for a smooth transition. Actually, in his place will be co-CEOs: Bob Mercer and Peter Brown.

This week a little story about a $50 billion investment fraud has metastasized. Madoff Securities, a brokerage firm that ran a secretive investment fund on the side, has closed down -- revealing that its steady 10% annual returns was a result of a Ponzi scheme. For some who trusted Madoff a week ago, they are today coming to grips with life without money. Is Madoff the only one out there? I doubt it. So you need to protect yourself.

How did Madoff accomplish this? That story has yet to be revealed. But founder Bernie Madoff revealed that he was using money from his most recent investors to pay off the earlier ones who requested their money. And a letter from hedge fund research and advisory firm, Aksia -- which steered its clients away from Madoff -- reveals five useful clues:

• Unknown accounting firm. Madoff used an accounting firm Friehling & Horowitz that employed three people -- one was a 78 year old living in Florida.
• Incomprehensible investment strategy too good to be true. Madoff employed a "split conversion strategy" which was never clearly defined and whose returns other traders could not duplicate.
• Deception about technology. Madoff claimed it was technologically sophisticated but a visitor to its offices found paper tickets sent through the mail.

Early this year, it looked like we'd see a flood of IPOs for hedge funds and private equity funds. But with the credit crunch -- and extreme market volatility -- this prediction looks like a bust.

Well, FT.com has a story that has some interesting buzz; that is, Renaissance Technologies is thinking of selling a stake to outside investors. This hedge fund manages about $30 billion and has one of the world's brightest investors at the helm, James Simons.

The FT.com says that Renaissance will not use a public offering; instead, it will do a private offering to institutions and wealthy investors. The system is known as Opus 5 and is a joint venture among the Bank of New York Mellon (NYSE: BK) Citigroup (NYSE: C), Lehman Brothers (NYSE: LEH), and Merrill Lynch (NYSE: MER)

In light of the awful public offerings of alternative investment firms -- such as Blackstone (NYSE: BX) and Fortress Investment Group (NYSE: FIG) -- I think the private option makes sense.

But, with the uncertainty in the market, it seems like bad timing. Maybe wait just a little while until the dust settles?

Tom Taulli is the author of various books, including The Complete M&A Handbook and The Edgar Online Guide to Decoding Financial Statements.

The most highly paid hedge fund manager made $1.7 billion in 2006, according to the New York Times. That's 28,333 times more than the roughly $60,000 that the median U.S. family made in 2006.

Hedge funds are a good business to be in if you can attract lots of capital and earn high returns from investing it. That's because hedge fund managers take 2% of the assets under management as an annual fee. And they earn 20% of the profits they make for their investors. James Simons, the 69-year-old former math professor, who pulled in $1.7 billion, uses complex computer-driven mathematical models to make bets on stocks, bonds and commodities at his fund Renaissance Technologies. Simons fee is 5% of assets under management and 44% of profits. But he beats the competition regularly. In 2006, the $6 billion Medallion fund posted gross returns of 84%; 44% after fees.

A doctor asked me why, if he was such as hot shot, these money people made so much more than he did. The answer is fairly simple. Doctors get paid on a per patient basis. No matter how many patients the doctors take on, there are only seven days a week and 24 hours in a day. And if a doctor takes some time off from work, that further limits the available hours. And the pay for many of the procedures doctors perform is limited by government regulations.

Ours is a society that rewards making money. And hedge fund and private equity managers make more of it for their investors than anyone else. As they love to say, if you pay peanuts, you get monkeys.

Peter Cohan is President of Peter S. Cohan & Associates, a management consulting and venture capital firm. He also teaches management at Babson College and edits The Cohan Letter.