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kgothatso | 7 months ago (raw) | export | reply | flag +1 
 Why do people see something that works and think "it can't work forever"?
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The Prestige | 7 months ago (raw) | root | parent | reply | flag +1 
 The "disposition effect"
That's how most people in finance leave money on the table. They will rather keep losers than keep the winner.

funny how the brain works😂
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Séimí Mac Síomón | 7 months ago (raw) | root | parent | reply | flag +1 
 Pessimism I would imagine.

It could be a defensive too:
Assume that something wont work, and you won't be disappointed when it doesn't, but pleasantly surprised when it does. 
Many people approach their love life this way.