1B Net worth. Ya it is possible. As a matter of fact, the Forbes 400 is littered with people who started with no money whatsoever. Sam Zell, Kirk Kerkorian, David Murdock, Alex Spanos, Thomas Flatley, Jorge Perez, Sheldon Adelson, George Argyos, Roland Arnall, Ronald Burkle, Wayne Huizenga, and a whole bunch of others.
Someone posted earlier about Sam Zell. I highly admire him as well. He had $35 in his wallet when he was 23 years old. As of right now I think he's worth over $5Billion. Started with a small 3 unit building which he bought for no money down by exchanging management services for a cut of the deal. As of 2000 his companies owned over 220,000 units of apartments, and over 135 Million square feet of commercial real estate, this was all done in less than 40 years. Is it possible?? If you think it is, then it is.
Also look up Kirk Kerkorian and a guy named Philip Ruffin. Kirk dropped out of 8th grade, and now owns half of the casinos on the Las Vegas strip. Ruffin started out flat broke, now owns RE all over the country including 40 acres on Las Vegas Blvd. the list goes on and on.... A guy named Stephen Seigel is on his way, google him he bought his first apartment building in his 30's in 2001, flipped it a year later and made $4Million. Now his companies own 20 hotels, 3 casinos and a bunch of other stuff. Yes, it is possible..... will you have to sacrifice a lot? No doubt.... just depends how far you can go and how bad you want to know what can be accomplished.
But, what do I know. I'm not a billionaire just a 25 year old trying to duplicate what Sam Zell did, and so far I'm ahead of where he was. Hopefully it continues to stay that way.