What does "He’s played down the extent to which wealth motivates him" mean?

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Musk, 47, doesn’t take a salary from Tesla, and he’s repeatedly gone to the market to buy the carmaker’s stock in a show of confidence in the company, which has never turned an annual profit. He recently put one of his Los Angeles-area homes on the market for $4.5 million.

He’s played down the extent to which wealth motivates him, tweeting in October that he had “very little time for recreation” and saying that he didn’t have “vacation homes or yachts or anything like that.”

The entrepreneur has a wide web of dealings with Morgan Stanley, whose private bank was the lender on his recent mortgages. When Musk pledged Tesla shares at the end of 2017, 55 percent were with the lender. Morgan Stanley, which has a $2.3 trillion wealth-management unit, has tripled loans to high-net-worth individuals in the past five years.