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it's not worth it

Used when talking about doing something that requires too much work for the result.
UPDATED: JUN 22
EXAMPLES:
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  1. 1st class from New York to Hong Kong cost US$15,580.  It's not worth it!

  2. It isn't worth your time to study only one month in the US.

  3. It isn't worth buying a new car these days because they are too expensive! 
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