The world's largest jackpot was a $656 million Mega Millions jackpot in March 2012.
If $600 million, the jackpot would currently include a $376.9 million cash option.
Clyde Barrow, a public policy professor at the University of Massachusetts-Dartmouth, specializes in the gaming industry.
He said one of the key factors behind the ticket-buying frenzy is the size of the jackpot -- people are interested in the easy investment.
"Even though the odds are very low, the investment is very small," he said. "Two dollars gets you a chance."
That may be why Ed McCuen has a Powerball habit that's as regular as clockwork.
The 57-year-old electrical contractor from Savannah, Ga., buys one ticket a week, regardless of the possible loot.
It's a habit he didn't alter Saturday.
"You've got one shot in a gazillion or whatever," McCuen said, tucking his ticket in his pocket as he left a local convenience store.
"You can't win unless you buy a ticket.
But whether you buy one or 10 or 20, it's insignificant."
Seema Sharma doesn't seem to think so.
The newsstand employee in Manhattan's Penn Station purchased $80 worth of tickets for herself.
She also was selling tickets all morning at a steady pace, instructing buyers where to stand if they wanted machine-picked tickets or to choose their own numbers.
"I work very hard -- too hard -- and I want to get the money so I can finally relax," she said. "You never know."