The hip-hop star was paid the enormous fee for just 30 minutes work the last time he rapped at a private bash, to celebrate a Jewish boy reaching the age of maturity.
50 insists he isn't prepared to appear for anything less than the staggering fee.
He told Blender magazine: "The last bar mitzvah I booked, I got paid £250,000 for 30 minutes. That's not a fixed rate, but it's in the ballpark." 50 is not the only music star making a fortune from private performances.
The Rolling Stones charge an astonishing £4 million per show - making them the most expensive party music act in the world.
American band The Eagles come a close second in the price per performance stakes, charging £3.75 million.
Canadian singer Celine Dion demands £3.3 million for a private show and Sir Elton John asked one British multi-millionaire to pay him £1 million to play at his wedding reception. Further down the scale, Beyoncé Knowles offers her services for £650,000 while Aerosmith will entertain you for £550,000.