I could not find a respected source of the above statement! You see people are using that statement allegedly stated by Bill Gates, to impress people to join their networking [multilevel marketing]business.
Here is what I got from Google search, a posting in Facebook in 2011! (click for a better view)
The billionaire Microsoft Chairman does have star attraction for those who wants to earn more money quickly.But beware: But the lure of riches is an untrustworthy mistress. And any entity using Bill Gates alleged statement does not inspire trust and confidence,important components for success in business.
The statement was actually stated by Mr. Robert Kiyosaki, author of Rich Dad, Poor Dad! - “If I had to do it all over again, rather than build an old style type of business, I would have started building a network marketing business.”
Verdict: An urban legend.