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When you consider how short your career can be due to injuries, yes. Not to mention that his exposure earns him more money if/when he's let go. He can bill himself as "former WWE Superstar Yoshi Tatsu" and command higher pay on the indy scene or Japan.
Money, they can make a lot more money in WWE then they could in Japan. Japan also does wrestling in tours, it's not a constant 365 day a year job like WWE wrestlers have.