Oct 25 (Reuters) - Sam Bankman-Fried has little to lose by bucking conventional wisdom and taking the stand at his criminal fraud trial, following weeks of testimony that he stole billions of dollars from unwitting customers of his FTX cryptocurrency exchange, legal experts said.

Bankman-Fried plans to take the stand in his own defense, his lawyer Mark Cohen said at a court hearing on Wednesday.

Doing so will expose Bankman-Fried to probing cross-examination by prosecutors who would come armed with documents, messages and testimony from cooperating witnesses that they can use to attack his credibility.

But given Bankman-Fried's penchant for risk, his willingness to speak publicly about the charges and prosecutors' unflattering portrayal of him at the trial, he may be betting on convincing even one juror that he did not intend to commit fraud, experts said.

"It's not irrational to testify, if you think you are going down because the evidence is so overwhelming," defense attorney Ilene Jaroslaw said.

A spokesperson for Bankman-Fried declined to comment.

Prosecutors expect to rest their case as soon as Thursday morning, and Bankman-Fried could take the stand soon after.

For Bankman-Fried to be convicted of fraud, prosecutors must show beyond a reasonable doubt that he intended to defraud FTX customers or investors. The 12 jurors must agree unanimously to return a verdict.

Defendants are not required to testify in criminal cases, but sometimes do so in a bid to raise doubt that prosecutors have proved their case.

Elizabeth Holmes took the stand at her criminal trial, testifying over several days that she did not intend to defraud investors in her blood-testing startup, Theranos. Holmes was ultimately convicted on four out of 11 counts and sentenced to more than 11 years in prison.

Bankman-Fried stands accused of looting customer money to make speculative venture investments, donate to political candidates, and repay lenders to his hedge fund Alameda Research.

The Massachusetts Institute of Technology graduate has pleaded not guilty. At trial, his lawyers have argued that he never intended to defraud anyone, and that many functions at the fledgling crypto exchange - including risk management - were "works in progress."

The 31-year-old former billionaire has already taken an unusual approach for a criminal defendant. Instead of laying low after he was charged, he published blog posts on his view of what went wrong and met with several journalists.

"I didn't steal funds, and I certainly didn't stash billions away," Bankman-Fried wrote in January, a month after his arrest on U.S. fraud charges.

Taking the stand carries the risk that he will be confronted with those media appearances as well as his use of social media.

But Bankman-Fried has a lower-than-average fear of risk, according to trial testimony.

Whereas most people are risk-averse, Bankman-Fried views himself as "risk-neutral," Caroline Ellison, former co-chief of Alameda, said on the stand.

Ellison was one of three former members of Bankman-Fried's inner circle who testified at trial, saying they committed crimes with him and adding to a portrayal by the government that Bankman-Fried's attorneys have called a "cartoon of a villain."

Mike Schachter, a defense attorney at Willkie Farr & Gallagher, said that, in some cases, taking the stand is the only way for a defendant to remove the "mask" put on them by prosecutors.

Schachter represented Tom Barrack, a onetime private equity executive and fundraiser for former President Donald Trump, and Lebanese businessman Jean Boustani in separate, unrelated criminal cases.

Both men took the stand at their trials and were ultimately acquitted.

In both cases, he felt it was important for them to be ready to testify on every allegation jurors had heard at the trial.

That level of preparedness is harder to achieve while in detention, where sleep is fleeting and the bus to court often leaves before dawn, he added.

"It really requires laser concentration. And they won't even give you a cup of coffee," he said.

Bankman-Fried has been held in Brooklyn's Metropolitan Detention Center since Aug. 11, when the judge overseeing the case jailed him for likely tampering with witnesses.

Reporting by Jody Godoy in New York; Editing by Tom Hals, Noeleen Walder and Jonathan Oatis

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