Including John Paulson, they play OPM (Other People's money).
Even for Warren Buffet, he satrted with $10,000 (was a big money back then), and I can assume he make 30% return year after year, never missed a year. After 30 years, his asset will grow to a little over 26 millions dollars. He is not even close to a billionairs. The reason he has 40 billions under his belt is because he manages other people's money. Can you do that? Can you convince people to put billions for you to play?
And, everybody talks how Buffet buy dip and hold them forever. Not many people know that lot of Buffet's purchases had string attached, some were warrant. The risks for Buffet were very low. For small investors like you and me, we just could not get those kind of deals.
For quick money, day trading beats investing, although DT is lot riskier, and only few made it.