For many mobile phone users, adding a cover is a very important ritual as it protects the device from scratches, dents and cracks
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It also enhances the durability of the phone, safeguarding it against accidental drops and impacts that could otherwise cause irreparable damage
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But some of the world's richest persons - Elon Musk, Jeff Bezos and Jay-Z - use their devices without any cover
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The message could be clear - "no case, no problem, because I can afford to replace it", but experts try to offer some explanation
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Thomai Serdari, the director of New York University's Fashion & Luxury MBA program, told Time Magazine that not using a phone case can depict class and values
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She believes that carrying a smartphone without a case speaks to an appreciation of design and aesthetics
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Many smartphone cases double as wallets, but the ultra-wealthy don't carry around wads of cash making such a case useless
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Also, a person with a private driver has no need for a convenient little slot to store a public transportation passes
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Billionaires also live in a luxury building with a doorman, so they don't need to carry keys reducing the possibility of their phones getting scratched
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The white-collar professionals also avoid bulky cases because they're more difficult to subtly stash away
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Finally, cases are bulky and collect dirt in hard-to-clean crevices, rendering fashionable mini purses unusable