Amal and George Clooney, pictured, will host a fundraising dinner for Hillary Clinton to which two tickets cost $US353,400. Photo: Getty

"Please join George and Amal Clooney for cocktails and dinner with Hillary Rodham Clinton", reads the straightforward invitation to an extraordinary event.

It is not the cocktails, dinner or heavyweight guest list that is drawing attention to the presidential hopeful's forthcoming election campaign fundraiser but the price of tickets, which cost more than seven times the US average annual income and four times that of workers in San Francisco, where the event is being held. 

Couples must fork out $US353,400 ($AU468,127) for the privilege of sitting on the top table with the Hollywood stars and the former secretary of state at the home of Shervin Pishevar, venture capitalist and major Uber investor.

Democratic presidential candidate Hillary Clinton is raising funds via a fund that enables donors to bypass the $2,700 individual donation limit. Photo: AP

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For those unable to raise the fortune to buy top-tier "event chair" tickets, couples can pay $US100,000 for "co-host" status - "includes Host Reception with the Clooneys and Hillary and preferred dinner seating" reads the invitation - and for $US33,400, individuals can attend the dinner and have a "photo with Hillary".

Beyond those scant details, little is known about the April 15 dinner's menus, its cocktails or the star performer who is likely to entertain the wealthy guests at the exceptionally expensive party.

The following day, Clinton will again meet the Clooneys at their Los Angeles mansion for a dinner at which a seat costs a further $US33,400 per person. 

Co-hosts include major Democratic party supporters Jeffrey and Marilyn Katzenberg and Hollywood director Steven Spielberg and his wife, Kate Capshaw, reports Politico. 

Funds for both events will go to the Hillary Victory Fund, a joint fundraising committee that enables individuals to bypass the usual maximum donation amount to an election campaign, capped at $US2,700 for the primary election and $US2,700 for the general election. Donations are not tax deductible.

The San Francisco and LA double-header is the third Victory Fund event and follows the "I'm With Her" concert at Radio City Music Hall on March 2.

The "one-night only concert with Elton John, Katy Perry, and Andra Day featuring remarks by Hillary Clinton, President Bill Clinton, and Chelsea Clinton" was a sell-out at the 6000-seat venue.

Prices ranged from $US125 "mezzanine" entry-level tickets to $US2,700 "diamond orchestra" class seats.

On December 17, British musician Sting hosted and performed at an event at St. Regis hotel on Fifth Avenue in Manhattan, to which tickets reportedly sold for $US100,000 per couple and started at $US33,400 for an individual. It was the campaign's first Victory Fund event, with  the evening raising a cool $US8 million.

On the same evening, ahead of the Sting concert, Chelsea Clinton, actress Drew Barrymore and her husband hosted a fundraiser not linked to the Victory Fund. Guests reportedly paid $US250 to $US2,700 for tickets.

According to Politico, Clinton's typical, non-A-list-actor fundraisers for the primary require hosts to raise $US10,000 to $US50,000. An invite-only fundraiser at the home of best-selling author John Grisham in Virginia last week required co-hosts to raise $US10,000, reports the site.

Clinton is not alone in her attempts to extract maximum value from America's wealthiest and most high profile Democratic Party supporters. 

President Barack Obama asked for donations of $US15 "to be in the running" to attend a fundraiser hosted by Clooney at his LA home in 2012, though tickets sold for many thousands of dollars. And the fundraising doesn't end come election day - last year, actress Gwyneth Paltrow hosted a $US15,000-a-head dinner for Obama in the garden of her LA home.

Not all DNC candidates play the same game, however. Bernie Sanders, who travels in economy class on flights around the US for the gruelling primaries trail, called the "corrupt" system behind Clinton's $US353,400 tickets "obscene". 

"It is obscene that secretary Clinton keeps going to big money people to fund her campaign," Senator Sanders told CNN. "Our events, we charge $US15 or $US50 for people to come."

"So, it's not a criticism of Clooney. It's a criticism of a corrupt finance system."

"I have a lot of respect for George Clooney. He's a great actor. I like him," he said. "But this is the problem with American politics. Big money is dominating our political system."