Answer to Priceless Valueless Painful Riddle

Answer to the Puzzle of the Day 2181 : Priceless Valueless Painful Riddle
Here is the refresher to the puzzle

Riddle : 
The cost of making only the maker knows,
Valueless if bought, but sometimes traded.
A poor man may give one as easily as a king.
When one is broken, pain and deceit are assured. 
What am I?

Here is the Answer : 

Answer : PROMISE
Explanation : 

The cost of making only the maker knows, :: A promise is made when it is valuable for the maker
Valueless if bought, but sometimes traded. :: And It cannot be bought or sold
A poor man may give one as easily as a king. :: Hence no poor no riches.
When one is broken, pain and deceit are assured. :: Since it is made on trust, One is hurt when it is broken

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